C2 adjective /ˈɒpjʊlənt/

opulent

豪華な

Meaning

Ostentatiously rich, luxurious, or lavish.

Example

They hosted an opulent wedding with gold decorations.

彼らは金色の装飾を施した豪華な結婚式を開催しました。

C1 noun /ˈɔr.ə.tər/

Orator

演説家

Meaning

a public speaker, especially one who is eloquent or skilled in speaking

Example

The famous orator delivered an inspiring speech.

有名な演説家が感動的なスピーチを行った。

B1 adjective /əˈrɪdʒ.ɪ.nəl/

Original

元の; 基本的な; 本物の

Meaning

first; fundamental; primary; authentic

Example

This is the original document, not a copy.

これはオリジナルの文書で、コピーではありません。

B2 noun /ˈaʊtskɜːrts/

outskirts

都市の郊外

Meaning

The outer parts of a town or city, away from the center.

Example

They moved to the outskirts of the city for a quieter life.

彼らは静かな生活を求めて都市の郊外に引っ越しました。

B2 verb /ˌoʊvərˈlʊk/

overlook

見落とす

Meaning

to fail to notice or consider something; to have a view from above

Example

It's easy to overlook small details when you're in a hurry.

急いでいると、細かい点を見落とすことがあります。

B2 noun /ˌɑb.lɪˈɡeɪ.ʃən/

Obligation

義務

Meaning

a duty or commitment; something that must be done legally or morally

Example

Parents have an obligation to care for their children.

親は子供の世話をする義務がある。

C1 noun /ˈɒfʃuːt/

offshoot

分岐

Meaning

A branch or result that develops from something larger or more important.

Example

The startup was an offshoot of a major tech company.

そのスタートアップは大手テクノロジー企業からの分岐でした。

B2 noun /ˈɔːɡənɪzəm/

organism

生物

Meaning

a living thing that has an organized structure and can grow and reproduce

Example

Every organism needs water to survive.

すべての生物は生き残るために水を必要とします。

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 /ˈaʊt.laɪn/

Outline

アウトライン; 概要; 計画

Meaning

a general description or plan showing the essential features of something; the main points

Example

The teacher provided an outline of the course syllabus.

先生はコースのアウトラインを提供しました。

B2 adjective /aʊtˈstændɪŋ/

outstanding

優れた

Meaning

extremely good or impressive; not yet resolved or paid

Example

She received an award for her outstanding performance.

彼女は優れたパフォーマンスで賞を受賞しました。

A1 noun /ɒkˈtoʊbər/

october

10月

Meaning

the tenth month of the year in the Gregorian calendar

Example

The weather becomes cooler in October.

10月になると天気が涼しくなります。

C1 verb /ˌoʊvərˈriːtʃ/

overreach

過剰な努力

Meaning

to go beyond what is proper, acceptable, or achievable; to overextend

Example

The politician overreached by making promises he couldn't keep.

その政治家は約束を守れなかったことで過剰な努力をしました。

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 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。

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 adjective /ˌəʊ.vərˈɑː.tʃɪŋ/

overarching

全体的な, 包括的な, 包み込む

Meaning

Comprehensive or all-embracing; forming an arch over something.

Example

The overarching theme of the book is human resilience.

その本の大きなテーマは人間の回復力です。

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。

A1 adjective /ˈɔːr.ɪndʒ/

Orange

オレンジ色

Meaning

having a color between red and yellow like that of a ripe orange fruit

Example

The orange sunset painted the sky magnificently.

オレンジ色の夕日は空を素晴らしく彩った。

B2 noun /ˈoʊ.dər/

Odour

臭い

Meaning

a distinctive smell, especially an unpleasant one

Example

The odour of fresh bread filled the kitchen.

新鮮なパンの臭いがキッチンに広がった。

A2 noun /əˈlɪmpɪks/

olympics

オリンピック競技大会

Meaning

an international sports competition held every four years with athletes from many countries

Example

The Olympics bring athletes from all over the world together.

オリンピックは世界中のアスリートを一堂に集めます。

C2 noun /ɑːlˈfækʃən/

olfaction

嗅覚

Meaning

The sense of smell; the process of detecting and perceiving odors.

Example

Dogs have a highly developed sense of olfaction.

犬は非常に発達した嗅覚を持っています。

B2 noun ˈɒksɪdʒən prəˈdʌkʃən

oxygen production

酸素生産

Meaning

The process of generating oxygen through photosynthesis or other means.

Example

Plants are vital for oxygen production and the maintenance of life.

植物は酸素の生産と生命の維持に不可欠です。

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。

B2 noun /ˈaʊtlʊk/

outlook

展望, 予測

Meaning

a person's general attitude or view; a forecast or prospect

Example

The economic outlook for the year is positive.

今年の経済の展望は前向きです。

C1 verb /aʊst/

oust

追放する

Meaning

To remove someone from a position or place of power or authority.

Example

The rebels ousted the dictator from power.

反乱者は独裁者を権力から追い出しました。

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.

B2 noun /ˈɔːrɡənaɪzər/

organizer

主催者

Meaning

a person who arranges or coordinates activities, events, or groups; a tool or item used to keep things in order

Example

She worked as the main organizer of the international conference.

彼女は国際会議の主要な主催者だった。

B2 adjective; verb (past participle) /ˈɒkjʊpaɪd/

occupied

使用中の；占領された

Meaning

being in use or taken; filled or lived in; controlled or held by force

Example

The room is occupied, so please wait outside.

その部屋は使用中なので、外で待ってください。

A1 adverb /aʊt/

out

外

Meaning

moving or appearing away from the inside or center; not at home or present

Example

He stepped out of the room quietly.

彼は静かに部屋を出ました。

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。

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。

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。

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。

B2 adjective /aʊtˈreɪdʒəs/

outrageous

ショッキング

Meaning

Shockingly bad or excessive; very unusual or amusing.

Example

The comedian told an outrageous joke.

コメディアンはショッキングなジョークを言いました。

C1 adjective əʊˈpeɪk

opaque

不透明, 理解しにくい

Meaning

Not able to be seen through; not transparent; difficult to understand.

Example

The glass was too opaque to see through.

そのガラスは不透明すぎて、透けて見えませんでした。

C1 verb /ˌaʊtˈweɪ/

outweigh

より重要である

Meaning

To be more important, valuable, or significant than something else.

Example

The benefits of the new policy outweigh the risks.

新しい政策の利益はリスクを上回っています。

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。

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。

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。

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。

C1 noun /ˈɒn.slɔːt/

onslaught

猛攻

Meaning

A fierce or destructive attack.

Example

The village faced an onslaught of enemy forces.

その村は敵軍の猛攻に直面しました。

C2 noun ˌɒbfəsˈkeɪʃən

obfuscation

難解化, 混乱

Meaning

The action of making something obscure, unclear, or unintelligible.

Example

The obfuscation of the data made it difficult to interpret.

データの難解化により、解釈が困難になりました。

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。

C1 adjective /ˌɔːrθəˈpiːdɪk/

orthopedic

骨や筋肉の変形の修正に関連する

Meaning

Relating to the correction of deformities of bones or muscles.

Example

She visited an orthopedic surgeon for her back pain.

彼女は背中の痛みのために整形外科医に行った。

B2 noun /ˌɑb.zɚˈveɪ.ʃən/

Observation

観察

Meaning

the action of watching something carefully; a comment or remark

Example

The scientist made careful observations of the experiment.

科学者は実験を慎重に観察しました。

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。

C1 noun /ˈɑd.ɪ.ti/

Oddity

珍奇な現象

Meaning

something that is strange or unusual; a peculiar trait

Example

His habit of sleeping standing up was considered an oddity.

彼の立って寝る習慣は珍奇な現象と見なされていました。

A1 pronoun /aʊərz/

ours

私たちの

Meaning

belonging to or associated with us

Example

This victory is ours.

この勝利は私たちのものです。

B2 noun /ˈoʊvərpæs/

overpass

高架橋

Meaning

A bridge that carries one road or railway over another.

Example

The new overpass reduced traffic congestion in the city.

新しい高架橋は市内の交通渋滞を減らしました。

A1 adverb /ˈɔːfən/

often

しばしば

Meaning

frequently, many times

Example

I often visit my grandparents on weekends.

私は週末にしばしば祖父母を訪れます。

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。

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。

C1 noun ˌɒk.sɪˈdeɪ.ʃən

oxidation

酸化

Meaning

A chemical reaction that involves the combination of a substance with oxygen, often causing deterioration.

Example

Oxidation causes metal surfaces to weaken.

酸化は金属表面を弱めます。

C1 verb /əbˈsɛs/

obsess

Meaning

To preoccupy or fill the mind of someone continually and to an excessive degree.

Example

She tends to obsess over small details.

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 /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。

A2 adverb /ˈɒbviəsli/

obviously

明らかに

Meaning

in a way that is easily perceived or understood; clearly

Example

Obviously, he didn’t read the instructions.

もちろん、彼は指示を読まなかった。

C1 adjective /aʊtˈmoʊdɪd/

outmoded

時代遅れ

Meaning

No longer in fashion or useful; outdated.

Example

That old computer is completely outmoded.

その古いコンピューターは完全に時代遅れです。

A2 adjective /ˈɔː.dɪ.nər.i/

Ordinary

普通の; 一般的な; 特別ではない

Meaning

normal; usual; not special

Example

It was just an ordinary day at the office.

それはオフィスでのただの普通の日でした。

A1 interjection /oʊ/

oh

オー

Meaning

used to express surprise, realization, or understanding

Example

Oh, I didn't know you were here!

オー、あなたがここにいるとは思わなかった！

C1 noun /ˈaʊtpoʊst/

outpost

前哨基地

Meaning

A small military camp or position at some distance from the main force, used especially as a guard.

Example

The soldiers were stationed at a remote outpost.

兵士たちは遠隔地の前哨基地に配置されました。

C1 verb /ˈɒs.ɪ.leɪt/

oscillate

二つの点または状態の間で前後に動くまたは揺れる

Meaning

To swing or move back and forth between two points or states

Example

The stock market tends to oscillate during uncertain times.

株式市場は不確実な時期に振動しがちです。

C1 adjective /əbˈsɛsɪv/

obsessive

執着的

Meaning

Relating to or characterized by an obsession; thinking about something too much.

Example

He has an obsessive interest in cleanliness.

彼は清潔さに執着的な興味を持っています。

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。

C1 adjective /ˌəʊvərˈstɪmjʊˌleɪtɪd/

overstimulated

Meaning

Excessively excited or aroused, overwhelmed by too much stimulus.

Example

Overstimulated minds can lead to burnout and decreased productivity.

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 conjunction /ɔːr/

or

または

Meaning

used to link alternatives

Example

You can have tea or coffee.

お茶かコーヒーをお選びいただけます。

C2 verb /ˌoʊvərˈstraɪd/

overstride

大きな一歩で越える

Meaning

To stride over something; to step across with long steps.

Example

He managed to overstride the narrow stream with ease.

彼は狭い小川を簡単に越えることができました。

A2 noun /ˈoʊpənɪŋ/

opening

開店

Meaning

an act or instance of beginning something

Example

The opening of the new store was a huge success.

新しい店のオープニングは大成功でした。

C1 noun ˈaʊt.sɔːr.sɪŋ

outsourcing

アウトソーシング

Meaning

The practice of having certain job functions done outside a company instead of having an in-house department or employee handle them.

Example

Many companies use outsourcing to reduce labor costs.

多くの企業はコスト削減のためにアウトソーシングを利用しています。

A1 verb, adjective /oʊn/

own

所有する

Meaning

to possess something; belonging to oneself

Example

She owns a beautiful house in the city.

彼女は市内に美しい家を持っています。

C1 verb /aʊtˈlæst/

outlast

他より長く続く

Meaning

to continue longer than; to endure beyond someone or something else

Example

The old castle has outlasted many generations.

その古い城は多くの世代を超えて生き残りました。

A1 pronoun /aʊər/

our

私たちの

Meaning

belonging to or associated with the speaker and one or more other people

Example

This is our house.

これは私たちの家です。

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。

C1 noun /əbˈstrʌkʃən/

obstruction

障害

Meaning

Something that blocks or gets in the way; the action of obstructing.

Example

There was an obstruction on the railway track.

鉄道の線路に障害がありました。

C1 adjective /ˈɑp.ər.ə.tɪv/

Operative

作動中の; 効力を持つ; 仕事をしている; 操作可能な;

Meaning

Functioning; in effect; working; active;

Example

The new safety protocols became operative immediately after the accident.

新しい安全プロトコルは事故後すぐに作動しました。

B2 noun /ˈaʊt.kʌm/

Outcome

結果; 結末;

Meaning

the result or consequence of an action or situation; the final product

Example

The outcome of the election surprised everyone.

選挙の結果は皆を驚かせました。

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。

B2 verb /əˈfend/

offend

侮辱する

Meaning

to cause displeasure or resentment; to hurt someone's feelings

Example

His rude comments offended many people at the meeting.

彼の無礼なコメントは会議で多くの人々を怒らせました。

C2 adjective /əˈfɪʃəs/

officious

干渉的な

Meaning

Excessively eager to offer unwanted help or advice; meddlesome.

Example

The officious guard kept interrupting the visitors with unnecessary instructions.

その干渉的な警備員は訪問者に不必要な指示で何度も中断させた。

C2 adjective /əbˈstrɛpərəs/

obstreperous

騒がしくて制御が難しい

Meaning

Noisy and difficult to control.

Example

The obstreperous students disrupted the class.

騒がしい学生たちが授業を妨害した。

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。

C1 noun /ˈoʊvərˌtʊr/

overture

序曲 / 提案

Meaning

An introduction to something more substantial; a proposal or preliminary action.

Example

The peace overture was welcomed by both nations.

平和提案は両国によって歓迎されました。

C2 adjective /ˈɒkjʊlər/

ocular

眼科の

Meaning

Relating to the eye or vision.

Example

The patient was referred to a specialist for ocular treatment.

患者は眼科専門医に紹介されました。

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。

B2 noun/verb /ˈaʊtreɪdʒ/

outrage

憤慨

Meaning

A strong feeling of anger and shock; to arouse anger or shock.

Example

The unfair decision caused public outrage.

不公平な決定が公共の憤慨を引き起こしました。

B2 adjective /ˈɒnɡəʊɪŋ/

ongoing

進行中

Meaning

continuing; still in progress

Example

The ongoing project will finish next month.

進行中のプロジェクトは来月終了します。

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。

C2 noun /ˈəʊpəs/

opus

創作作品

Meaning

A creative work, especially a large and important piece of music or art.

Example

The composer considered the symphony his greatest opus.

作曲家は交響曲を自分の最も偉大な創作作品と見なしていました。

C1 noun /ˌəʊvərɪksˌplɔɪˈteɪʃən/

overexploitation

過剰搾取

Meaning

The unsustainable use of natural resources at a rate that exceeds their ability to regenerate, leading to depletion and environmental degradation.

Example

Overexploitation of natural resources leads to environmental degradation.

自然資源の過剰搾取は環境の悪化を引き起こします。

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。

A1 adverb /ɔːf/

off

オフ

Meaning

away from a place, position, or time; not functioning

Example

He turned off the light before leaving the room.

彼は部屋を出る前に電気をオフにしました。

C2 adjective /ˈɒfɪʃ/

offish

無愛想

Meaning

Unfriendly, distant, or reserved in manner.

Example

He seemed offish at the party and avoided most conversations.

彼はパーティーで無愛想に見え、大半の会話を避けていました。

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。

A2 adjective /ˈɑp.ə.zɪt/

Opposite

反対の; 完全に異なる; 向かい合っている; 逆の;

Meaning

Contrary; completely different; facing each other; reverse;

Example

They have opposite views on politics but remain good friends.

彼らは政治に関して対立した見解を持っていますが、良い友達のままです。

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 /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。

C2 adjective /ˌoʊvərˈwiːnɪŋ/

overweening

過度に傲慢な

Meaning

excessively arrogant or prideful

Example

His overweening pride cost him many friends.

彼の過度の誇りは多くの友人を失わせました。

C1 adjective /ˌaʊt ən ˈaʊt/

out-and-out

完全な

Meaning

complete; absolute; used to emphasize something extreme

Example

The speech was an out-and-out lie.

そのスピーチは完全な嘘だった。

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。

C1 adjective /ˌɒstɛnˈteɪʃəs/

ostentatious

見せびらかしの

Meaning

Characterized by a showy or pretentious display intended to impress others.

Example

He wore an ostentatious gold chain to the party.

彼はパーティーで見せびらかしの金のチェーンをしていました。

B2 noun /ˈɒp.tɪ.mɪ.zəm/

optimism

楽観主義

Meaning

Hopefulness and confidence about the future or the successful outcome of something.

Example

Her optimism helped her overcome difficult times.

彼女の楽観主義は、困難な時期を乗り越える助けとなりました。

B1 verb /ˈɒpəreɪtɪŋ/

operating

運営する

Meaning

to control or manage the functioning of something

Example

The company has been operating in this market for five years.

その会社はこの市場で5年間運営されています。

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。

A2 adjective /ˈɒb.vi.əs/

Obvious

明白な; 簡単に理解できる

Meaning

easily perceived or understood; clear and apparent to the mind

Example

It was obvious that she was upset about something.

それは彼女が何かについて不満を抱えていることが明らかでした。

A1 adverb /wʌns/

Once

一度; 過去に

Meaning

one time only; at some time in the past; formerly

Example

I have been to Paris once in my life.

私は一度だけパリに行ったことがあります。

B2 noun, verb /ˈaʊtlɔː/

outlaw

Meaning

as a noun: a person who breaks the law and lives outside its protection; as a verb: to make something illegal

Example

The government decided to outlaw the harmful practice.

C1 noun /ˌɑːk.sɪˈmɔːr.ɒn/

oxymoron

オキシモロン

Meaning

a figure of speech where two contradictory terms are combined

Example

The phrase 'deafening silence' is a classic oxymoron.

「耳をつんざくような静けさ」というフレーズは、典型的なオキシモロンです。

C2 noun /ˈoʊ.vər.let/

Overlet

ベッドパッド

Meaning

a thin mattress or pad placed over a bed for additional comfort

Example

The overlet makes the bed more comfortable to sleep on.

オーバーレットはベッドをより快適にして眠りやすくします。

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。

C1 adjective /ɒˈstɛnsəbl/

ostensible

見せかけの

Meaning

stated or appearing to be true, but not necessarily so

Example

His ostensible reason for leaving was illness, but many doubted it.

彼の出発の見せかけの理由は病気だったが、多くの人がそれを疑っていた。

B1 noun /ˈɑː.lɪv/

Olive

オリーブ

Meaning

a small oval fruit with a hard pit, typically green or black, used for eating or making oil

Example

Olive oil is considered one of the healthiest cooking oils available.

オリーブオイルは、最も健康的な料理用オイルの一つと見なされています。

C1 noun /ˈɔːrθədɑːksi/

orthodoxy

正統

Meaning

traditional or generally accepted beliefs and practices

Example

The religious leader defended the orthodoxy of the faith.

宗教指導者は信仰の正統性を守った。

B1 adjective /ˌoʊvərˈweɪt/

overweight

過体重

Meaning

heavier than is considered healthy or normal

Example

The doctor advised him to lose weight as he was overweight.

医者は体重を減らすようにアドバイスしました、なぜなら彼は過体重だったからです。

C2 noun /ˈɔːrdnəns/

ordnance

軍需品

Meaning

Military supplies including weapons, ammunition, and combat equipment.

Example

The army stored ordnance in a secure facility outside the city.

軍隊は都市外の安全な施設に軍需品を保管していた。

C1 noun /ˈɔːrdɪnəns/

ordinance

条例

Meaning

An authoritative rule, law, or decree issued by a city, town, or authority.

Example

The city council passed an ordinance banning smoking in public parks.

市議会は公共公園での喫煙を禁じる条例を可決しました。

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。

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。

C1 noun /ˈoʊ.vər spɪl/

Over-spill

オーバーフロー

Meaning

the overflow of liquid from a container; excess that cannot be contained

Example

The overspill from the river flooded nearby farms.

川の溢れが近くの農場を水浸しにした。

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。