B1 verb অকার্স

occurs

起こる

Meaning

Happens or takes place, especially as a result of something.

Example

Snowfall occurs in regions with freezing temperatures.

雪は氷点下の温度を持つ地域で起こります。

B2 noun /ˈɑp.tə.mɪst/

Optimist

楽観主義者

Meaning

a person who tends to be hopeful and confident about the future; someone who sees the good side of things

Example

As an optimist, she always believed things would improve.

楽観主義者として、彼女は常に物事が改善されると信じていました。

C2 noun /əbˈstrʌkʃənɪst/

obstructionist

Meaning

a person who deliberately delays or prevents progress by being uncooperative or oppositional

Example

The obstructionist in the committee kept delaying the decision-making process.

C1 noun /ˌɑːpərˈtuːnɪst/

opportunist

機会主義者

Meaning

A person who takes advantage of situations for personal gain, often disregarding principles.

Example

He is seen as an opportunist who always puts his interests first.

彼は常に自分の利益を第一に考える機会主義者として見られています。

B2 verb /ɒpt/

opt

選ぶ

Meaning

to choose or decide to do something instead of something else

Example

Many students opt to study abroad for better opportunities.

多くの学生がより良い機会のために海外で学ぶことを選択します。

B1 noun ˌɒpəˈtjuːnɪtiz

opportunities

チャンス

Meaning

A set of circumstances that makes it possible to do something; chances for advancement or success.

Example

Opportunities for jobs decreased.

仕事のチャンスが減少しました。

C2 adjective /ɒmˈnɪp.ə.tənt/

omnipotent

全能

Meaning

Having unlimited power; able to do anything; all-powerful.

Example

In many religions, God is considered omnipotent.

多くの宗教では、神は全能だと考えられています。

C1 adjective /əbˈzɜːrvənt/

Observant

観察力のある

Meaning

quick to notice things; watchful; attentive

Example

The observant detective noticed every small detail at the crime scene.

観察力のある探偵は犯罪現場のあらゆる小さな詳細に気づきました。

C2 noun /ˌɔːrnɪˈθɑːlədʒi/

ornithology

鳥類学

Meaning

the scientific study of birds

Example

She pursued ornithology to understand the migration patterns of birds.

彼女は鳥の移動パターンを理解するためにオルニソロジーを追求しました。

B1 noun /ˈɔːfɪsər/

officer

警官

Meaning

a person in a position of authority, especially in law enforcement

Example

The officer gave him a ticket for speeding.

警官はスピード違反で彼にチケットを渡した。

B2 verb /əˈblaɪdʒ/

oblige

義務付ける

Meaning

to compel or require someone to do something; to help or do a favor

Example

I would be happy to oblige you with the information you need.

必要な情報を提供してお手伝いできれば嬉しいです。

B2 verb /ˌoʊvərˈiːt/

overeat

幸福

Meaning

To eat more food than the body needs.

Example

She tends to overeat when she is stressed.

彼女は賞を受け取ったとき、喜びを隠すことができませんでした。

B1 noun /ˈɒbstəkəlz/

obstacles

障害物

Meaning

Things that block one's way or prevent or hinder progress.

Example

Obstacles in life can often lead to valuable lessons.

人生の障害物はしばしば貴重な教訓に繋がる。

C1 noun ˈoʊʃən əˌsɪdɪfɪˈkeɪʃən

ocean acidification

海洋酸性化

Meaning

The ongoing decrease in the pH of the Earth's oceans, caused by the absorption of carbon dioxide from the atmosphere.

Example

Ocean acidification is caused by atmospheric CO2 absorption.

海洋酸性化は、大気中のCO2の吸収によって引き起こされます。

C2 adjective /ɑːlˈfæktəri/

olfactory

Meaning

Relating to the sense of smell.

Example

The perfume activated her olfactory nerves immediately.

C1 noun /oʊθ/

Oath

誓い

Meaning

a solemn promise or declaration; a sworn statement

Example

The doctor took an oath to help patients.

医師は患者を助けることを誓いました。

C1 adjective /ˈɒm.ɪ.nəs/

Ominous

不吉な; 脅威の

Meaning

giving the impression that something bad will happen; threatening; foreboding

Example

The dark clouds looked ominous before the storm.

嵐の前に、暗い雲は不吉に見えました。

B2 noun /ˌaʊtˈsaɪdə(r)/

outsider

アウトサイダー

Meaning

a person who is not accepted as a member of a particular group or community

Example

As a new student, she often felt like an outsider at school.

新しい学生として、彼女は学校でよくアウトサイダーのように感じていました。

C1 adjective /əbˈdʒek.ʃən.ə.bəl/

Objectionable

不快な

Meaning

arousing distaste or opposition; unpleasant or offensive

Example

His objectionable behavior made everyone uncomfortable.

彼の不快な行動は、皆を不快にさせた。

C1 verb /ˌaʊtˈduː/

outdo

超える

Meaning

To do better than someone else; to surpass.

Example

She always tries to outdo her classmates in exams.

彼女は試験でクラスメートを常に超えようとします。

C2 adjective /ˌoʊpəˈlɛsənt/

opalescent

オパール色の

Meaning

showing or reflecting a milky, iridescent light like an opal

Example

The opalescent sky glowed with shades of pink and blue.

オパレッセントな空はピンクと青の色合いで輝いていた。

B1 noun /ˌɒp.əˈtjuː.nə.ti/

opportunity

チャンス

Meaning

A favorable chance or set of circumstances that makes it possible to do something.

Example

She seized the opportunity to study abroad.

彼女は海外で勉強するチャンスをつかんだ。

C2 noun /ɒmˈnɪpətəns/

omnipotence

全能

Meaning

The quality of having unlimited power or authority.

Example

Many religions describe God’s omnipotence as absolute.

多くの宗教では神の全能は絶対的なものと説明されています。

C2 adjective /ɒˈstɛnsɪv/

ostensive

明示的

Meaning

clearly demonstrative or pointing out; explicitly shown

Example

The teacher gave an ostensive example to clarify the concept.

先生はその概念を明確にするために、明示的な例を示しました。

B2 noun ɔːˈɡæn.ɪk fuːdz

organic foods

オーガニック食品

Meaning

Food produced without the use of chemicals such as artificial pesticides, fertilizers, or other artificial agents.

Example

Organic foods are healthier than processed foods.

オーガニック食品は加工食品よりも健康的です。

C2 verb /əbˈtruːd/

obtrude

押し付ける

Meaning

to force oneself or one's ideas into a situation uninvited or inappropriately

Example

He didn’t want to obtrude into their private conversation.

彼は彼らのプライベートな会話に押し付けたくなかった。

B2 noun /əˈpoʊ.nənt/

Opponent

対戦相手; ライバル

Meaning

a person who disagrees with or resists a proposal or practice; someone who competes against another

Example

The chess player defeated his strongest opponent.

チェスのプレーヤーは最強の対戦相手を倒した。

B2 verb /oʊˈmɪt/

omit

省略する

Meaning

to leave out or exclude; to fail to include something

Example

Please don't omit any important details from your report.

レポートから重要な詳細を省略しないでください。

A2 adjective /ˈaʊtdɔːr/

outdoor

アウトドア

Meaning

situated, existing, or done outside a building

Example

We planned an outdoor picnic for the weekend.

週末のためにアウトドアピクニックを計画しました。

B2 noun /ˈaʊtˌbreɪk/

outbreak

発生

Meaning

a sudden start or occurrence of something unpleasant, like disease or violence

Example

There was an outbreak of flu in the city.

街でインフルエンザが発生した。

C1 noun /əˈkɜr.əns/

Occurrence

出来事

Meaning

an instance or event of something happening; the fact of occurring

Example

The occurrence of earthquakes is common in this region.

この地域では地震の出来事が一般的です。

C1 noun /ˈɒstrəsɪzəm/

ostracism

追放

Meaning

The act of excluding someone from a group or society.

Example

The student faced ostracism after breaking the rules.

その学生は規則を破った後、追放に直面しました。

C1 noun /ˈɔr.ə.kəl/

Oracle

オラクル

Meaning

a person regarded as a source of wise counsel; in ancient times, a priest or priestess acting as a medium

Example

The ancient Greeks consulted the oracle at Delphi.

古代ギリシャ人はデルポイのオラクルに相談しました。

B2 noun /əˈfens/

Offence

違反; 犯罪

Meaning

a breach of law or rule; an annoyance or resentment

Example

Stealing is a serious offence punishable by law.

窃盗は法律で罰せられる重大な違反です。

B1 adverb /ˈʌðərwaɪz/

Otherwise

さもないと; 他の方法で

Meaning

in a different way; if not; or else; apart from that

Example

Study hard, otherwise you will fail the exam.

一生懸命勉強しなさい、さもないと試験に落ちます。

B2 verb /ˌoʊvərˈpeɪ/

overpay

過剰に支払う

Meaning

To pay more than is necessary or reasonable.

Example

She realized she had overpaid for the concert tickets.

彼女はコンサートのチケットに多く支払ったことに気づきました。

B2 noun /ˈaʊtˌfɪt/

outfit

衣装

Meaning

A set of clothes worn together, often for a particular occasion.

Example

She wore a beautiful outfit to the party.

彼女はパーティーに美しい衣装を着て行った。

B1 noun ˈɒk.sɪ.dʒən

oxygen

酸素。無色無臭の気体で、生命に不可欠な成分です。

Meaning

A colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.

Example

Oxygen is vital for life.

酸素は生命にとって不可欠です。

A2 noun /ˈʌn.jən/

Onion

玉ねぎ

Meaning

a round vegetable with a strong taste and smell, made up of many layers

Example

I need to chop some onions for the curry recipe.

カレーのレシピのためにいくつか玉ねぎを切る必要があります。

C2 verb /oʊˈpaɪn/

opine

意見を述べる

Meaning

to express an opinion or belief

Example

The professor opined that the policy would fail.

教授はその政策が失敗するだろうと述べました。

C2 noun /ˌɔːrnɪˈθɒlədʒɪst/

ornithologist

鳥類学者

Meaning

a scientist who studies birds

Example

The ornithologist spent years studying migratory birds.

そのオルニソロジストは渡り鳥を研究するために何年も費やしました。

C1 noun/verb /ˈoʊvərˌhæŋ/

overhang

突出部

Meaning

To extend outward and hang over something; a projecting part.

Example

The roof overhang provides shade in the summer.

屋根のオーバーハングは夏に日陰を提供します。

C1 verb /əbˈstrʌkt/

obstruct

妨げる

Meaning

to block or hinder progress; to prevent or impede movement

Example

The fallen tree obstructed the road for several hours.

倒れた木が数時間道路をふさぎました。

B2 adjective /ˈɒp.tɪ.məl/

optimal

最適、最良

Meaning

Best or most favorable; the most effective under particular conditions.

Example

The optimal temperature for plant growth is around 25°C.

植物の成長に最適な温度は約25°Cです。

C1 noun /ˈɑːdəsi/

odyssey

長い旅

Meaning

a long, adventurous journey; a series of experiences

Example

Her career has been an odyssey of challenges and achievements.

彼女のキャリアは挑戦と成果の長い旅でした。

B2 noun /ˈɒpəreɪtər/

operator

オペレーター

Meaning

a person who operates equipment, a business, or controls something

Example

The machine operator ensured that everything ran smoothly.

機械オペレーターは、すべてがスムーズに動作することを確認しました。

B2 adjective /ˈɒp.ʃən.əl/

Optional

任意

Meaning

not compulsory; left to choice

Example

Wearing a tie is optional for this event.

このイベントではネクタイの着用は任意です。

C2 noun ˈɒpjʊləns

opulence

富裕

Meaning

Great wealth or luxuriousness.

Example

The opulence of the mansion was evident in its ornate furnishings.

豪邸の富裕さはその華やかな家具に明らかでした。

C2 noun /oʊf/

Oaf

不器用で愚かな、無神経な人

Meaning

a clumsy, stupid, or insensitive person

Example

Don't be such an oaf - handle the dishes carefully!

そんなオーフにならないで – お皿は気をつけて洗って！

C2 verb /ˈoʊɡəl/

ogle

じっと見る

Meaning

To look at someone with obvious sexual interest.

Example

He kept ogling the models on the runway.

彼はランウェイのモデルたちを見続けた。

A2 modal verb /ɔːt/

ought

べき

Meaning

Used to indicate duty, correctness, or moral obligation.

Example

You ought to respect your elders.

あなたは年長者を尊敬すべきです。

C2 noun /ˈoʊ.kəm/

oakum

古いロープの繊維

Meaning

loose fibers obtained by untwisting old ropes, used for caulking ships

Example

The shipbuilders used oakum to seal the gaps in the wooden planks.

船大工たちは木の板の隙間を塞ぐためにオーカムを使いました。

C2 noun /ˌɒktədʒəˈnɛəriən/

octogenarian

80歳代の人

Meaning

A person who is between 80 and 89 years old.

Example

The octogenarian still jogs every morning to stay healthy.

そのオクトジェネリアンは毎朝健康を維持するためにジョギングをしています。

C2 noun /ˈɔːfəl/

offal

内臓

Meaning

the internal organs and entrails of an animal used as food; waste parts

Example

The butcher prepared sausages using pork offal.

肉屋は豚の臓物を使ってソーセージを作った。

B2 noun /ˈɔr.fən.ɪʒ/

Orphanage

孤児院

Meaning

an institution for the care and education of children who have lost their parents

Example

The charity built a new orphanage for homeless children.

チャリティーはホームレスの子供たちのために新しい孤児院を建てました。

C1 noun /ˌɒbstəˈtrɪʃən/

obstetrician

産科医

Meaning

A doctor specializing in pregnancy, childbirth, and women's reproductive health.

Example

The obstetrician monitored the mother’s health throughout the pregnancy.

産科医は妊娠中の母親の健康を監視しました。

C2 adjective /ˈoʊ.pən ˈhæn.dɪd/

Open-handed

寛大な; 自由な

Meaning

Generous; liberal; giving freely;

Example

He is very open-handed with his money and always helps those in need.

彼は自分の金に非常に寛大で、いつも困っている人々を助けています。

B2 adjective /ˌoʊvərˈwɛlmɪŋ/

overwhelming

圧倒的

Meaning

Very intense; overpowering.

Example

Large tasks can feel overwhelming.

大きな仕事は圧倒的に感じることがあります。

C2 noun /ˌɒstɛnˈteɪʃən/

ostentation

見せびらかし

Meaning

excessive display of wealth or knowledge intended to attract admiration or envy

Example

The billionaire’s party was full of ostentation and luxury.

億万長者のパーティーは、見せびらかしと贅沢で満ちていた。

C2 noun /ˌɔːrdɪˈneɪʃən/

ordination

任命式

Meaning

The ceremony of conferring holy orders or official religious authority.

Example

The church held a special service for the ordination of new priests.

教会は新しい神父の任命のために特別なサービスを行いました。

A2 pronoun /aʊərˈsɛlvz/

ourselves

私たち自身

Meaning

used by the speaker to refer to themselves and one or more others as the object of the verb

Example

We should help ourselves before helping others.

私たちは他の人を助ける前に、自分たち自身を助けるべきです。

B2 noun /ˈɒkjʊpənt/

occupant

乗客

Meaning

A person who resides in or is present in a house, vehicle, seat, or place.

Example

The car had three occupants at the time of the accident.

事故の時、車には三人の乗客がいました。

C2 verb /ˈɑːblɪˌɡeɪt/

obligate

強制する

Meaning

to bind legally or morally; to compel someone to do something

Example

The contract obligates the company to provide timely service.

契約は会社にタイムリーなサービスを提供することを義務付けます。

C1 verb /ˌaʊtˈstrɪp/

outstrip

凌駕する

Meaning

To go faster or do better than someone or something; to surpass.

Example

The company outstripped its competitors in sales last year.

その会社は昨年、販売で競合他社を上回った。

B2 verb /ˈɒkjʊpaɪ/

occupy

占める / 占有する / 居住する

Meaning

to take up space or time; to live or work in a place

Example

The new family will occupy the house next month.

新しい家族は来月その家に入居する予定です。

C1 noun ɔːrˈdiːl

ordeal

厳しい試練

Meaning

A physical or mental painful experience that must be endured

Example

Surviving the wilderness was a tough ordeal for them.

荒野で生き残ることは彼らにとって大変な試練でした。

B1 noun ˌɔː.ɡən.aɪˈzeɪ.ʃən

organization

組織

Meaning

An organized group of people with a particular purpose, such as a business or government department.

Example

The organization was officially inaugurated in 2024.

その組織は2024年に公式に開設されました。

A1 noun/adjective/adverb /ˌaʊtˈsaɪd/

outside

外

Meaning

the external part or surface of something; beyond the boundary

Example

Children were playing outside in the yard.

子供たちは庭で外で遊んでいました。

B2 verb /əˈpoʊz/

oppose

反対する

Meaning

to disagree with or resist; to act against

Example

Many citizens oppose the new tax policy.

多くの市民が新しい税制政策に反対しています。

C2 noun /əˈprəʊ.bri.əm/

opprobrium

非難, 恥辱

Meaning

Harsh criticism or public disgrace.

Example

The scandal brought opprobrium on the politician.

スキャンダルは政治家に非難を浴びせた。

B2 adverb /ˈoʊpənli/

Openly

率直に; 公然と

Meaning

in a frank and honest way; without concealment; publicly

Example

She spoke openly about her struggles with mental health.

彼女はメンタルヘルスの問題についてオープンに話した。

C2 adjective /əbˈsiːkwɪəs/

obsequious

お世辞

Meaning

Excessively obedient or attentive in a servile way.

Example

The waiter gave an obsequious bow to every customer.

ウェイターは各顧客にお世辞のようなお辞儀をしました。

C1 adjective ˈɒk.sɪ.də.tɪv

oxidative

酸化に関連する

Meaning

Related to or caused by oxidation, especially cellular damage from free radicals.

Example

Excess stress can lead to oxidative damage in cells.

過度のストレスは細胞に酸化的な損傷を引き起こす可能性があります。

C2 noun /ˈɒksɪdənt/

occident

西洋

Meaning

The countries of the West, especially Europe and America.

Example

The Occident has a long history of philosophical thought.

西洋には長い哲学的思考の歴史があります。

C2 noun /ˈoʊvərlɔːrd/

overlord

領主

Meaning

A ruler, master, or person of great power and authority over others.

Example

The peasants were forced to pay taxes to their overlord.

農民たちは自分たちの領主に税金を払うよう強制されました。

B2 noun /ɔːrˈɡæn.ɪk ˈfɑːr.mɪŋ/

organic farming

有機農業

Meaning

Farming method that avoids synthetic chemicals and fertilizers, using natural methods instead.

Example

Organic farming improves soil health and reduces pollution.

オーガニックファーミングは土壌の健康を改善し、汚染を減らします。

B2 noun /əˌrɪʒ.əˈnæl.ə.ti/

Originality

独創性

Meaning

the quality of being novel or unusual; the ability to think independently and creatively

Example

The artist's work showed great originality and creativity.

アーティストの作品は大きな独創性と創造性を示した。

B2 noun /ˌoʊ.vɚˈkraʊ.dɪŋ/

overcrowding

過密

Meaning

Excessive crowd or packed condition, having more people or vehicles in a place than the approved capacity.

Example

The subway system suffers from severe overcrowding during peak hours.

地下鉄システムはピーク時にひどい過密状態に苦しんでいます。

B2 noun /ˈɒs.trɪtʃ/

Ostrich

ダチョウ

Meaning

a large flightless bird native to Africa with long legs and neck

Example

The ostrich is the world's largest bird.

ダチョウは世界最大の鳥です。

C2 adjective /ˌɒbsəˈlɛsnt/

obsolescent

時代遅れの

Meaning

Becoming outdated or on the way to becoming obsolete.

Example

The obsolescent technology could not compete with modern devices.

時代遅れの技術は現代のデバイスには競争できなかった。

B2 noun /əbˈsɛʃən/

obsession

執着

Meaning

An idea, thought, or concern that continually preoccupies or intrudes on a person's mind.

Example

His obsession with success drove him to work day and night.

成功への執着が彼を昼夜働かせた。

C1 adjective /ˌaʊt əv ðə ˈweɪ/

out-of-the-way

人里離れた場所

Meaning

remote or unusual; not in a convenient or usual location

Example

They stayed in an out-of-the-way village.

彼らは人里離れた村に滞在しました。

C1 noun /ˈɔːrkɪd/

Orchid

オーキッド

Meaning

a diverse family of flowering plants known for their exotic and often fragrant flowers

Example

The white orchid on the windowsill bloomed for months.

窓辺の白いオーキッドは何ヶ月も咲き続けました。

C2 noun /oʊd/

ode

オード

Meaning

a lyrical poem, often expressing praise or strong emotions

Example

The poet wrote an ode to the beauty of nature.

詩人は自然の美に対するオードを書いた。

C2 noun /ˈaʊtˌrɪɡər/

outrigger

安定構造

Meaning

a projecting structure on a boat, used for stability, or a boat fitted with such support

Example

The fisherman paddled his outrigger canoe across the lagoon.

漁師はアウトリガー付きのカヌーをラグーンを越えて漕ぎました。

B2 verb /ˌoʊvərˈwɛlm/

overwhelm

Meaning

to overpower someone emotionally or physically; to be too much to handle

Example

She was overwhelmed with gratitude after receiving the help.

A2 adverb; noun /ˌaʊtˈdɔːrz/

outdoors

屋外で

Meaning

outside a building; the natural environment outside

Example

We spent the whole afternoon outdoors enjoying the fresh air.

私たちは午後ずっと屋外で新鮮な空気を楽しみました。

C2 noun /ˌɒn.əˌmæt.əˈpiː.ə/

onomatopoeia

オノマトペ

Meaning

The formation of a word from a sound associated with what is named.

Example

The word 'buzz' is an example of onomatopoeia.

'バズ'という言葉はオノマトペの一例です。

B2 noun /ˈɔːɡən/

organ

臓器

Meaning

a part of the body that performs a specific function

Example

The heart is an important organ in the human body.

心臓は人間の体の重要な臓器です。

C1 noun ˌɒb.səˈlɛs.əns

obsolescence

陳腐化

Meaning

The process of becoming obsolete or outdated and no longer used.

Example

The rapid advancement of technology leads to the obsolescence of old devices.

テクノロジーの急速な進歩は古いデバイスの陳腐化を引き起こします。

A1 pronoun /ˈʌðərz/

others

他の人々

Meaning

people or things distinct from the ones already mentioned or known

Example

I like to spend time with others.

私は他の人々と時間を過ごすのが好きです。

C1 adjective /əˈkʌlt/

occult

オカルト

Meaning

Relating to mysterious, supernatural, or magical powers and practices.

Example

She had always been fascinated by the occult and its hidden knowledge.

彼女は常にオカルトとその隠された知識に魅了されていた。

A2 noun /ˈɒf.ɪs/

office

オフィス

Meaning

a room or building where people work, usually at desks

Example

She left the office early to attend a family event.

彼女は家族のイベントに出席するために早くオフィスを出ました。

B1 noun /aʊl/

Owl

フクロウ

Meaning

a nocturnal bird of prey with large eyes and a hooked beak

Example

The owl hooted softly in the darkness of the forest.

フクロウは森の暗闇で静かに鳴いた。

C1 adjective /oʊˈbiːs/

obese

肥満

Meaning

Extremely overweight; having an excessive amount of body fat.

Example

The doctor advised the obese patient to adopt a healthier lifestyle.

医者は肥満患者に健康的な生活様式を採用するように勧めました。

C1 adjective /ɒmˈnɪv.ər.əs/

Omnivorous

雑食性

Meaning

eating both plants and animals; feeding on various kinds of food

Example

Bears are omnivorous animals that eat both plants and meat.

クマは雑食性の動物で、植物と肉を食べます。

B2 adverb /ˈaʊtraɪt/

Outright

直接に; 完全に; ためらわずに

Meaning

completely; directly; without reservation or concealment

Example

She rejected the proposal outright.

彼女はその提案を直接拒否した。

C2 adjective /ˈɑːsɪˌfaɪd/

ossified

骨に変わった、硬直した

Meaning

Turned into bone or become rigid; unwilling to change.

Example

The company had an ossified management structure that resisted innovation.

その会社は、革新に抵抗する硬直した管理構造を持っていました。

C2 noun /ˈɒfərtɔːri/

offertory

奉納

Meaning

The part of a religious service when offerings are collected; the offering itself.

Example

The offertory was taken during the Sunday service.

日曜日の礼拝中に奉納が取られました。

B1 adjective /ˌoʊvərˈsiːz/

overseas

海外

Meaning

in or to a foreign country across the sea

Example

He went overseas for higher education.

彼は高等教育のために海外に行った。

C2 adjective /ˈoʊdiəs/

odious

忌まわしい

Meaning

extremely unpleasant or repulsive

Example

The dictator was remembered for his odious crimes.

その独裁者は彼の忌まわしい犯罪で記憶されました。

C2 noun /ɒkˈteɪvoʊ/

octavo

オクターヴォ (紙を8つに折りたたんで作られた本のサイズ)

Meaning

A size of book page resulting from folding a sheet of paper into eight leaves (sixteen pages).

Example

The old library contained rare octavo editions of Shakespeare.

古い図書館にはシェイクスピアの珍しいオクターヴォ版がありました。

C2 adjective /ˈɒsiəs/

osseous

骨のような

Meaning

consisting of or turned into bone; bony

Example

The fossil showed osseous structures of the ancient creature.

化石は古代の生物の骨のような構造を示しました。

C2 noun /ˈɑːbəlɪsk/

obelisk

オベリスク

Meaning

A tall, four-sided, narrow tapering monument with a pyramid-shaped top.

Example

The ancient Egyptians built obelisks to honor their gods.

古代エジプト人は神々を讃えるためにオベリスクを建てました。

B2 noun /oʊk/

oak

オークの木

Meaning

a large tree that produces acorns and has strong, hard wood

Example

The old oak tree provided shade for the entire yard.

古いオークの木は庭全体に日陰を提供しました。

C1 adjective /ˌoʊvərˈbloʊn/

overblown

誇張された

Meaning

excessively exaggerated or inflated

Example

The controversy was overblown by the media.

メディアによって論争は誇張されました。

B2 noun /ˈɔɪ.stər/

Oyster

オイスター

Meaning

a type of shellfish that can be eaten and sometimes contains pearls

Example

She ordered fresh oysters at the seafood restaurant.

彼女はシーフードレストランで新鮮なオイスターを注文しました。

B2 noun /ɒpˈtɪʃən/

optician

眼鏡技師

Meaning

A person who makes or sells glasses and contact lenses.

Example

The optician adjusted my new glasses to fit better.

オプティシャンは私の新しい眼鏡をより良くフィットするように調整しました。

C2 verb /əbˈvɜːrt/

obvert

反転する

Meaning

To turn something so as to face in a different direction; in logic, to convert a proposition by negating both subject and predicate.

Example

The teacher asked the students to obvert the statement for practice.

先生は生徒たちに練習のためにその声明をオブバートするように頼みました。

C2 adjective /ˈoʊ.pən ˈhɑrt.ɪd/

Open-hearted

オープンハート; 寛大で誠実; 心温かく受け入れる;

Meaning

Kind and generous; sincere and honest; warmly receptive;

Example

She welcomed the strangers with an open-hearted smile and invited them for dinner.

彼女は見知らぬ人々を心温かい笑顔で迎え、夕食に招待した。

A2 noun əˈlɪm.pɪk ɡeɪmz

Olympic Games

オリンピック競技大会

Meaning

The world's largest international sports competition held every four years, bringing together athletes from different countries to compete in various sports.

Example

The Olympic Games bring together the world's top athletes.

オリンピック競技大会は世界のトップアスリートを集めます。

C1 noun /ˌoʊvərprəˈdʌkʃən/

overproduction

過剰生産

Meaning

The act of producing more of something than is needed or can be consumed.

Example

The economic crisis was caused by the overproduction of goods.

経済危機は商品の過剰生産によって引き起こされた。

B1 noun əbˈdʒek.tɪv

objective

目標

Meaning

A thing aimed at or sought; a goal.

Example

The main objective is to test sustainability.

メインオブジェクティブは持続可能性をテストすることです。

C1 verb /əˈfɪʃieɪt/

officiate

執り行う

Meaning

To perform official duties, especially in a ceremony or as a referee.

Example

The priest will officiate the wedding ceremony.

司祭が結婚式を司る。

B2 noun /ˌɔː.ri.enˈteɪ.ʃən/

orientation

オリエンテーション

Meaning

the process of becoming familiar with a new situation or environment

Example

The company provides an orientation for all new employees.

会社はすべての新しい従業員にオリエンテーションを提供します。

A2 adjective /ɒd/

Odd

奇妙な; 異常な; 正常または予想されるものとは異なる

Meaning

strange; unusual; different from what is normal or expected

Example

That's an odd way to solve the problem.

それは問題を解決する奇妙な方法です。

B2 verb /əbˈteɪn/

obtain

取得する

Meaning

to get or acquire something

Example

You need to obtain a visa before traveling abroad.

あなたは海外に行く前にビザを取得する必要があります。

C1 adjective /ˈəʊnərəs/

onerous

重い

Meaning

involving a great deal of effort, difficulty, or burden

Example

Fulfilling the contract proved to be an onerous task for the company.

契約を履行することは会社にとって負担の大きい仕事だと証明された。

C1 noun /oʊˈbɪt.ʃu.er.i/

Obituary

訃報

Meaning

a notice of someone's death published in a newspaper; biographical account of deceased person

Example

The newspaper published his obituary yesterday.

新聞は昨日彼の訃報を掲載しました。

B2 noun/verb /ˌoʊvərˈlæp/

overlap

Meaning

To extend over and cover partly; an area where things coincide.

Example

The two meetings overlap by an hour.

B1 adverb /əˈrɪdʒɪnəli/

originally

元々

Meaning

in the beginning, at first

Example

Originally, she wanted to be a doctor.

元々、彼女は医者になりたかった。