C2 adjective /ˈoʊ.vɔɪd/

ovoid

卵型

Meaning

egg-shaped; resembling an oval or ellipse

Example

The artist painted an ovoid shape in the center of the canvas.

アーティストはキャンバスの中央に卵型の形を描きました。

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。

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。

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。

C1 adjective /ˌɔːrnəˈmɛntl/

ornamental

装飾的な

Meaning

Serving as decoration; decorative rather than functional.

Example

The garden was filled with ornamental plants.

庭は装飾的な植物でいっぱいだった。

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。

C1 adjective əˈblɪv.i.əs

oblivious

無自覚

Meaning

Being completely unaware of surrounding events.

Example

He was oblivious to the noise around him while reading.

彼は読書中に周りの騒音に全く無自覚だった。

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。

C2 noun /oʊˈbleɪʃən/

oblation

奉納

Meaning

a religious offering, especially of bread or wine to God

Example

The priest placed the oblation on the altar during the ceremony.

司祭は儀式の間に祭壇に奉納を置きました。

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 /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.

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。

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 /ˌoʊpəˈlɛsəns/

opalescence

オパレスセンス

Meaning

a milky or pearly appearance of a surface like that of an opal

Example

The pearl had a gentle opalescence under the light.

パールは光の下で優しいオパレスセンスを持っていました。

B2 adjective /ˌfæʃ.ənd/

Outdated

時代遅れ

Meaning

obsolete; no longer current

Example

This computer software is completely outdated.

このソフトウェアは完全に時代遅れです。

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。

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。

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。

C1 noun /ɔːr/

Oar

オール

Meaning

a long pole with a flat blade used to row a boat

Example

He dipped the oar into the water and pulled the boat forward.

彼はオールを水に浸し、ボートを前に進めた。

C1 adverb /ˈɒp.tɪ.məl.i/

optimally

最適に

Meaning

In the most effective or efficient way possible.

Example

Tasks should be allocated optimally for maximum output.

タスクは最大の成果を上げるために最適に割り当てるべきです。

A2 noun /ˈɒpərə/

opera

オペラ

Meaning

a dramatic performance in which the actors sing most of their lines

Example

We watched a beautiful opera at the theater last night.

昨晩、劇場で美しいオペラを観ました。

B1 noun /ˈɔr.ə.ʒɪn/

Origin

起源

Meaning

the point or place where something begins, arises, or is derived; the source

Example

Scientists are studying the origin of the universe.

科学者たちは宇宙の起源を研究しています。

B2 adjective ɔːrˈɡæn.ɪk

organic

有機

Meaning

Produced or involving production without the use of chemical fertilizers, pesticides, or other artificial agents.

Example

Organic farming improves soil health and reduces pollution.

有機農業は土壌の健康を改善し、汚染を減少させます。

C2 noun /ˈoʊdiəm/

odium

嫌悪

Meaning

general or widespread hatred or disgust directed toward someone as a result of their actions

Example

The scandal brought public odium on the corrupt minister.

スキャンダルは腐敗した大臣に対する公衆の嫌悪を引き起こした。

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。

B2 noun /ˈaʊtbɜːrst/

outburst

感情または活動の突然の爆発

Meaning

a sudden release of strong emotion or activity

Example

She had an angry outburst during the meeting.

会議中に彼女は怒りの爆発をした。

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。

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。

A1 adjective /oʊˈkeɪ/

ok

わかった

Meaning

used to indicate agreement, approval, or understanding

Example

Okay, let's go to the park.

わかった、じゃあ公園に行こう。

C2 verb /ˈɒsɪfaɪ/

ossify

骨化する

Meaning

to turn into bone or become rigid and inflexible

Example

With age, some tissues tend to ossify.

年を重ねると、一部の組織が骨化する傾向があります。

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。

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。

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。

C1 verb /ˌoʊvərˈθroʊ/

overthrow

幸せ

Meaning

To remove a leader or government from power, often by force.

Example

The rebels planned to overthrow the corrupt regime.

彼女は賞を受け取ったとき、幸せを隠すことができなかった。

A1 preposition /ɒn/

on

上

Meaning

physically in contact with and supported by a surface

Example

The book is on the table.

本はテーブルの上にあります。

C1 adjective /ˈɔːrdɪnəl/

ordinal

順序数

Meaning

Relating to the order or position of something in a sequence (first, second, third, etc.).

Example

The ordinal number 'third' indicates position in a sequence.

'第三'の順序数は、順番での位置を示します。

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。

C1 noun /əbˈzɜːvəns/

observance

遵守

Meaning

The practice of following a custom, rule, or religious law.

Example

The festival is held in observance of a centuries-old tradition.

その祭りは、数世代にわたる伝統を遵守して行われます。

C1 noun /ˈɒptɪks/

optics

光学

Meaning

The branch of physics dealing with light and vision.

Example

She studied optics to understand how lenses work.

彼女はレンズがどのように機能するかを理解するために光学を学びました。

C1 adverb /ˈaʊtwədli/

Outwardly

外見上; 表面的に;

Meaning

on the surface; externally; in appearance

Example

Outwardly, he seemed calm, but inside he was nervous.

外見上は落ち着いて見えましたが、内心では緊張していました。

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。

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。

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。

B2 verb əbˈzɜːrvd

observed

祝う

Meaning

To celebrate or keep a religious or other festival.

Example

The day is observed annually to raise awareness.

その日は毎年意識を高めるために祝われます。

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 /ˈoʊtˌmiːl/

oatmeal

オートミール

Meaning

A type of porridge made from ground oats, often eaten for breakfast.

Example

She eats a bowl of oatmeal every morning for breakfast.

彼女は毎朝、朝食にオートミールを一杯食べます。

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。

B2 noun ˈaʊt.pʊt

output

生産量

Meaning

The amount of something produced by a person, machine, or industry.

Example

Climate change reduces agricultural output.

気候変動は農業の生産量を減少させます。

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。

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。

C2 noun /ˈɒbsɪkwiːz/

obsequies

葬儀儀式

Meaning

Funeral rites or ceremonies.

Example

The obsequies for the late leader drew thousands of mourners.

故リーダーの葬儀儀式には、数千人の弔問客が集まりました。

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。

A2 noun /ɔɪl/

Oil

油

Meaning

a viscous liquid derived from petroleum or plants, used for cooking or fuel

Example

Heat the oil in a pan before adding the vegetables.

野菜を加える前にフライパンで油を温めます。

C1 verb /ˈoʊvərˌhɔːl/

overhaul

完全な改修

Meaning

to examine thoroughly and repair or improve something that is worn or ineffective

Example

The company decided to overhaul its outdated computer system.

会社は古くなったコンピュータシステムのオーバーホールを決定した。

C2 verb ˈɑːb.fə.skeɪt

obfuscate

曖昧にする、混乱させる、隠す

Meaning

Render obscure, unclear, or unintelligible.

Example

Politicians often obfuscate facts to mislead people.

政治家はしばしば事実をわかりにくくして人々を誤導します。

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。

C2 noun /ˌɑːpərˈtuːnɪzəm/

opportunism

機会主義

Meaning

The practice of taking advantage of opportunities regardless of principles or ethics.

Example

His decision was driven by opportunism, not values.

彼の決定は、価値観ではなくオポチュニズムに動機づけられていました。

B1 adjective /əˈbiː.di.ənt/

Obedient

従順な

Meaning

willing to comply with orders or instructions; submissive

Example

The obedient student always follows the teacher's instructions.

従順な生徒はいつも先生の指示に従う。

A2 adjective/adverb /ˈɒnˌlaɪn/

online

オンライン

Meaning

connected to or available through the internet

Example

I prefer shopping online rather than going to stores.

私はお店に行くよりもオンラインで買い物をする方が好きです。

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。

C1 verb ˈɔːr.kɪ.streɪt

orchestrate

調整する

Meaning

To plan or coordinate the elements of (a situation) to produce a desired effect, especially surreptitiously.

Example

He skillfully orchestrated the entire event.

彼は巧妙に全体のイベントを調整しました。

C2 adjective /ˈɔːrnəri/

ornery

気難しい

Meaning

bad-tempered and combative; stubborn

Example

The ornery old man refused to leave his chair.

その気難しい老人は椅子を離れようとしませんでした。

B2 noun /ˈaʊt.breɪk/

Out-break

発生

Meaning

a sudden occurrence or eruption of something, especially disease or violence

Example

The outbreak of flu affected many students in the school.

インフルエンザの流行は学校の多くの生徒に影響を与えた。

C2 noun /ˈɔː.rɪ.fɪs/

orifice

孔

Meaning

an opening or hole, especially in the body or a device

Example

The medicine was applied through a small orifice in the device.

薬は装置の小さな孔から適用されました。

B1 verb /ˈɒpəreɪt/

operate

操作する

Meaning

to function; to control or manage; to perform surgery

Example

The surgeon will operate on the patient tomorrow.

外科医は明日患者を手術します。

B2 adverb /ˌoʊvərˈnaɪt/

Overnight

一晩で; 突然; 非常に速く

Meaning

during the night; suddenly; very quickly

Example

The city was transformed overnight.

街は一晩で変わった。

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。

C1 noun /ˈɒf.sprɪŋ/

offspring

子孫

Meaning

a person's child or children; an animal's young

Example

The bird carefully fed its offspring.

その鳥は注意深く自分の子孫に餌を与えました。

C1 adjective/adverb /ˌɒfˈhænd/

offhand

軽率

Meaning

Without previous thought or preparation; casual and sometimes dismissive.

Example

She gave an offhand reply to his serious question.

彼女は彼の真剣な質問に対して、軽率な返答をした。

B2 noun /ˈaʊtɪŋ/

outing

お出かけ

Meaning

a short trip or excursion, often for leisure or enjoyment

Example

They had a lovely outing at the beach last weekend.

彼らは先週末、ビーチで素晴らしいお出かけをしました。

C2 verb /ˌaʊtməˈnuːvər/

outmaneuver

巧妙に出し抜く

Meaning

to gain an advantage over an opponent by skillful or clever action

Example

The smaller company managed to outmaneuver its larger rival.

小さな会社は大きな競争相手を巧妙に出し抜くことに成功した。

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.

C1 noun əˈblɪv.i.ən

oblivion

忘却, 破壊, 消失

Meaning

The state of being unaware or unconscious of what is happening; complete forgetfulness.

Example

His name faded into oblivion over time.

彼の名前は時と共に忘却の中に消えた。

C1 adjective /ˌoʊvərˈbɛrɪŋ/

overbearing

押しつけがましい

Meaning

unpleasantly or arrogantly domineering

Example

His overbearing attitude made everyone uncomfortable.

彼の押しつけがましい態度は、みんなを不快にさせた。

B2 adjective /ˈaʊtˌɡoʊɪŋ/

outgoing

社交的

Meaning

Friendly and sociable; inclined to mix with others.

Example

He is an outgoing person who loves meeting new people.

彼は新しい人々と会うのが好きな社交的な人です。

C2 adjective /ˈɔːrəˌtʌnd/

orotund

豊かで明確な声

Meaning

full, rich, and clear in sound; pompous in style

Example

The actor's orotund voice filled the theater.

俳優の豊かな声が劇場に響き渡った。

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。

B2 adverb /əˈfɪʃəli/

officially

公式に

Meaning

in a formal or authorized way

Example

The building was officially opened by the mayor.

その建物は市長によって公式に開かれました。

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。

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。

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 /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。

B1 adjective /ˌoʊld ˈfæʃənd/

old-fashioned

昔風の

Meaning

not modern; belonging to an earlier time

Example

He still wears an old-fashioned hat.

彼は今でも昔風の帽子をかぶっています。

C1 adjective /əˈblɪɡ.ə.tɔː.ri/

obligatory

義務的

Meaning

Required by a legal, moral, or other rule; compulsory.

Example

Wearing a seatbelt is obligatory in most countries.

ほとんどの国でシートベルトを着用することは義務です。

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。

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。

C2 noun /ˌɔːrəˈtɔːri.oʊ/

oratorio

宗教音楽作品

Meaning

A large-scale musical composition for orchestra, choir, and soloists, usually on a sacred theme, performed without costumes or scenery.

Example

Handel's 'Messiah' is one of the most famous oratorios ever written.

ヘンデルの『メサイア』は最も有名なオラトリオの1つです。

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。

C1 adjective /oʊˈvɜːrt/

overt

公然

Meaning

Done or shown openly; not hidden or secret.

Example

There was an overt display of hostility between the rivals.

ライバルの間に公然とした敵意の表れがあった。

C1 verb /əˈprɛs/

oppress

抑圧する

Meaning

to keep someone down by harsh and unfair use of authority; to suppress

Example

The dictator oppressed the people for decades.

独裁者は何十年も人々を抑圧した。

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 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。

C2 noun /ˈɔːrzmən/

Oarsman

オールマン

Meaning

a person who rows a boat, especially as a member of a racing crew

Example

The experienced oarsman rowed the boat across the river.

経験豊富なオールマンは川を渡るためにボートを漕いだ。

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。

A1 verb /ˈoʊpən/

open

開ける

Meaning

to move something so as to allow access; to begin

Example

Please open the door for me.

ドアを開けてください。

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.

C2 verb /əˈkluːd/

occlude

閉塞する

Meaning

To block or close up an opening or passage.

Example

The pipe was occluded by mineral deposits.

パイプは鉱物の堆積物で閉塞されていました。

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。

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。

C1 noun /ˈoʊ.mən/

Omen

未来の良いまたは悪い運命の兆し

Meaning

an event regarded as a sign of future good or bad luck

Example

Many people consider a black cat crossing your path a bad omen.

多くの人々は、黒猫が道を横切ることを悪いオーメンだと考えています。

C1 noun /ˌɑːsɪˈleɪʃən/

oscillation

振動

Meaning

The movement back and forth at a regular speed.

Example

The oscillation of the pendulum controls the clock.

振り子の振動が時計を制御します。

C1 noun /ˌɒk.sɪ.dʒɪˈneɪ.ʃən/

oxygenation

酸素供給または治療

Meaning

The process of supplying or treating with oxygen.

Example

Deep breathing exercises improve oxygenation of the body.

深呼吸の練習は身体の酸素供給を改善します。

B2 noun oʊˈbiː.sə.t̬i

obesity

肥満

Meaning

The condition of being grossly fat or overweight.

Example

Obesity increases the risk of diabetes and heart disease.

肥満は糖尿病と心臓病のリスクを高めます。

C2 noun /ˈɒlɪv brɑːntʃ/

olive-branch

オリーブの枝

Meaning

A symbol of peace or reconciliation; an offer to end conflict.

Example

He extended an olive-branch to his rival after years of hostility.

彼は長年の敵対後、ライバルにオリーブの枝を差し出した。

C1 adjective /əbˈstrʌk.tɪv/

Obstructive

妨害的な

Meaning

deliberately creating difficulties or preventing progress; hindering or blocking something

Example

The obstructive policies hindered economic growth.

妨害的な政策は経済成長を阻害した。

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。

A1 pronoun, noun, adjective /wʌn/

one

一

Meaning

the number equivalent to the sum of zero and one; a single person or thing

Example

Only one student answered the question.

ただ一人の学生が質問に答えました。

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。

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！

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。

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。

C1 noun /ˈɔr.i.ənt/

Orient

東洋、特に東アジアの国々

Meaning

the East, especially countries of eastern Asia; to determine one's position or direction

Example

Many spices come from the Orient.

多くの香辛料がオリエントから来ています。

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。

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。

C1 adjective /ˌɒbsəˈliːt/

obsolete

時代遅れ

Meaning

No longer in use or out of date.

Example

Floppy disks are now completely obsolete.

フロッピーディスクは現在完全に時代遅れです。

B2 adjective /ˌɔːɡənaɪˈzeɪʃənəl/

organizational

組織的

Meaning

relating to the structure or arrangement of a company or group

Example

He works on improving the organizational structure of the company.

彼は会社の組織構造を改善するために働いています。

B2 noun /əbˈzɜːvər/

observer

観察者

Meaning

a person who watches or notices something

Example

The observer took notes during the meeting.

観察者は会議中にメモを取った。

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 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。

B2 noun /wʌn θɜːd/

one-third

三分の一

Meaning

one part of something that is divided into three equal parts

Example

One-third of the class was absent today.

クラスの三分の一が今日は欠席でした。

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。