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。

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。

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。

C2 noun /ˈoʊpiət/

opiate

Meaning

a drug containing opium or its derivatives, used to relieve pain or cause sleep

Example

The doctor prescribed an opiate to relieve the patient's pain.

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 /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 /ˌɔː.riˈen.təl/

Oriental

東アジアの国々に関連する; 東方

Meaning

relating to the countries of East Asia; eastern

Example

The museum has a beautiful collection of oriental art.

博物館には美しいオリエンタルアートのコレクションがあります。

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。

B2 adverb /ˈɒdli/

oddly

奇妙に

Meaning

in a strange or unusual way; unexpectedly

Example

Oddly, he didn’t seem upset by the bad news.

奇妙に、彼は悪い知らせにも動揺していなかった。

C2 verb /ˈɑːbvieɪt/

obviate

排除する

Meaning

To remove a need or difficulty; to prevent or avoid something.

Example

This new system obviates the need for manual data entry.

この新しいシステムは手動データ入力の必要性を排除します。

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。

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。

B2 adjective + noun ˈɒptɪməl ˈtempərətʃər

optimal temperature

最適温度

Meaning

The best or most favorable temperature for a particular purpose

Example

Winter provides optimal temperature for farming.

冬は農業に最適な温度を提供します。

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。

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 /ɔːrˈθɑːɡənl/

orthogonal

直交

Meaning

at right angles; independent or unrelated

Example

In mathematics, two vectors are orthogonal if their dot product is zero.

数学では、2つのベクトルが直交している場合、そのドット積はゼロです。

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。

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。

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。

C2 adjective /ˈɑːbdjʊrət/

obdurate

頑固

Meaning

Stubbornly refusing to change one's opinion or course of action.

Example

He remained obdurate despite everyone's pleas.

彼は皆の懇願にもかかわらず、頑固なままでした。

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。

B2 adjective /əˈfen.sɪv/

Offensive

攻撃的な; 侮辱的な; 攻撃的

Meaning

causing displeasure or resentment; insulting; aggressive

Example

His offensive remarks hurt everyone's feelings.

彼の攻撃的な発言は、全員の気持ちを傷つけました。

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。

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 verb /ˌoʊvərˈrʌn/

overrun

侵略する

Meaning

to spread over or occupy completely; to exceed a limit or time

Example

The garden was overrun with weeds.

庭は雑草に覆われていた。

C1 noun /ˈoʊvərˌsiːər/

overseer

監督者

Meaning

a person who supervises work or workers; a manager

Example

The overseer made sure the workers followed safety rules.

監督者は、労働者が安全規則を守っていることを確認しました。

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。

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。

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。

A2 noun /ˈoʊ.ʃən/

ocean

海洋

Meaning

A very large expanse of sea, especially the main areas of sea between continents.

Example

The ocean covers more than 70% of the Earth's surface.

海洋は地球の表面の70％以上を覆っています。

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 adjective /ˌɒmnɪˈprezənt/

omnipresent

至る所に存在する

Meaning

(of God) present everywhere at the same time.

Example

Social media has become an omnipresent force in modern society.

ソーシャルメディアは現代社会において至る所に存在する力となりました。

B1 adjective, adverb /ˈoʊvərɔːl/

overall

全体的に

Meaning

in general or as a whole

Example

Overall, the project has been successful.

全体的に、プロジェクトは成功しました。

B1 noun /ˌɑk.jəˈpeɪ.ʃən/

Occupation

職業; 仕事; 占領

Meaning

a job or profession; the action of taking control of a place

Example

Teaching is her chosen occupation.

教えることは彼女の選んだ職業です。

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。

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。

B1 noun /ˈɑb.stə.kəl/

Obstacle

障害物

Meaning

something that blocks or makes progress difficult; a barrier

Example

Bad weather was the main obstacle to our journey.

悪天候が私たちの旅行の最大の障害物でした。

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 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。

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。

A2 noun /ˈʌv.ən/

Oven

オーブン

Meaning

an enclosed compartment used for heating, baking, or drying food

Example

She baked cookies in the oven for thirty minutes.

彼女はオーブンで三十分間クッキーを焼きました。

B2 noun /əˈfɛns/

offense

犯罪

Meaning

an illegal act; a crime

Example

The offense was committed in broad daylight.

その罪は昼間に犯されました。

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。

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。

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。

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 noun /ˈɒrɪz(ə)n/

orison

祈り

Meaning

a prayer, especially a devout or formal one

Example

He whispered a quiet orison before going to sleep.

寝る前に静かな祈りをささやいた。

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。

C1 verb ˈɔː.kɪ.streɪ.tɪd

orchestrated

精巧に組織された

Meaning

Planned or coordinated carefully and deliberately.

Example

The attacks were orchestrated with precision.

攻撃は正確に組織されていた。

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。

A2 noun /ˈoʊ.nər/

Owner

所有者

Meaning

a person who owns something; someone who has legal possession of property

Example

The owner of the restaurant greeted us warmly.

レストランの所有者は私たちを温かく迎え入れてくれました。

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 /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。

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 noun /ˈɒktəɡən/

octagon

八角形

Meaning

A polygon with eight sides and eight angles.

Example

The stop sign is shaped like an octagon.

ストップサインは八角形をしています。

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 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。

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。

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 adjective /ˈɒptɪk/

optic

視覚の

Meaning

Relating to the eye or vision.

Example

The optic nerve carries signals from the eye to the brain.

視神経は目から脳に信号を伝達します。

C1 noun /əˈfen.dər/

Offender

犯罪者; 法律違反者

Meaning

a person who commits an illegal act; someone who breaks the law

Example

The young offender was sentenced to community service.

その若い犯罪者はコミュニティサービスを命じられました。

B1 noun /əˈpɪn.jən/

Opinion

意見

Meaning

a view or judgment formed about something; a belief or assessment based on grounds short of proof

Example

In my opinion, this is the best solution.

私の意見では、これは最良の解決策です。

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。

B2 noun/verb /ˈoʊvərˌdoʊs/

overdose

過剰摂取

Meaning

An excessive and dangerous amount of a drug; to take too much of a substance.

Example

He was rushed to the hospital after a drug overdose.

薬物の過剰摂取で病院に運ばれました。

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。

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。

B1 noun ˌɔː.ɡən.aɪˈzeɪ.ʃənz

organizations

組織

Meaning

Organized groups of people with a particular purpose

Example

Organizations play a key role in policymaking.

組織は政策形成において重要な役割を果たします。

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。

C2 adjective /ˌoʊdəˈrɪfərəs/

odoriferous

芳香のある

Meaning

having or giving off a smell, especially a strong or pleasant one

Example

The garden was filled with odoriferous flowers.

庭は芳香のある花でいっぱいでした。

B2 noun /oʊˈbiː.di.əns/

Obedience

服従

Meaning

compliance with an order, request, or law; submission to authority

Example

Children should show obedience to their parents.

子供たちは両親に従うべきです。

C1 noun /ˈoʊvərˌtoʊn/

overtone

微妙な意味

Meaning

A subtle quality, implication, or additional meaning beyond the obvious.

Example

His speech had political overtones that were hard to ignore.

彼のスピーチには無視できない政治的なニュアンスが含まれていました。

C1 noun /ˈaʊtˌkraɪ/

outcry

抗議

Meaning

A strong expression of public anger or disapproval.

Example

The decision sparked an outcry among the citizens.

その決定は市民の間で抗議を引き起こしました。

B2 noun /əbˈdʒek.ʃən/

Objection

異議; 反対; 抗議;

Meaning

an expression of disagreement or disapproval; a reason for disagreeing

Example

The lawyer raised an objection during the trial.

弁護士は裁判中に異議を唱えました。

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。

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。

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。

B1 noun /əˈkeɪ.ʒən/

Occasion

機会; 特別な出来事

Meaning

a particular time or instance of an event; a special celebration

Example

Their wedding was a joyous occasion.

彼らの結婚式は喜ばしい機会でした。

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。

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。

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。

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。

B2 adjective /ˈɔɪl.i/

Oily

油っぽい; 油で覆われた; 脂っこい

Meaning

covered with oil; containing oil; greasy

Example

Her oily skin needs special care.

彼女の油っぽい肌は特別なケアが必要です。

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。

C2 adjective /ˈəʊ.dər.əs/

Odorous

芳香のある; 香り高い

Meaning

having a strong smell; fragrant; aromatic

Example

The garden was filled with odorous flowers.

庭は芳香のある花で満たされていた。

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 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。

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。

C1 adjective /əbˈnɒkʃəs/

Obnoxious

不快な

Meaning

extremely unpleasant; offensive; annoying

Example

His obnoxious behavior at the party annoyed everyone.

彼のパーティーでの非常に不快な振る舞いは、皆を困らせた。

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。

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 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 adjective /əˈpəʊzd/

opposed

反対の

Meaning

being against or in disagreement with something

Example

She is strongly opposed to animal testing.

彼女は動物実験に強く反対しています。

C1 verb /ˌaʊtˈstrɛtʃ/

outstretch

外に伸ばす

Meaning

To extend or stretch something outward.

Example

He outstretched his hand to help her up.

彼は彼女を助けるために手を差し出した。

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 verb /ˌoʊvərˈkʌm/

overcome

克服する

Meaning

To succeed in dealing with a problem or difficulty.

Example

You can overcome procrastination with planning.

計画を立てて先延ばしを克服できます。

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。

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。

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 /ˈɑb.lə.kwi/

Obloquy

厳しい批判または言葉による虐待; 公共の非難

Meaning

harsh criticism or verbal abuse; strong public condemnation

Example

The politician faced obloquy after the scandal.

政治家はスキャンダルの後、厳しい批判を受けました。

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。

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。

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！

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 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。

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。

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。

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 adjective /ɑːlˈfæktəri/

olfactory

Meaning

Relating to the sense of smell.

Example

The perfume activated her olfactory nerves immediately.

B2 adjective, verb /əbˈskjʊr/

obscure

不明確

Meaning

Not clearly expressed or understood; to make something difficult to see or understand.

Example

The meaning of the poem was obscure to most readers.

詩の意味はほとんどの読者には不明確でした。

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。

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。

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。

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。

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。

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。

C1 adjective /əˈbliːk/

Oblique

斜め; 対角線; 間接的または回避的

Meaning

slanting; diagonal; indirect or evasive

Example

The artist drew an oblique line across the canvas.

アーティストはキャンバスに斜めの線を描いた。

C2 noun ˈoʊʃən ˌstrætɪfɪˈkeɪʃən

ocean stratification

海洋の成層

Meaning

The formation of layers in ocean water due to differences in density.

Example

Ocean stratification affects marine biodiversity.

オーシャンストラティフィケーションは海洋生物多様性に影響を与えます。

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。

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。

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。

C1 adjective /əˈblaɪdʒɪŋ/

obliging

親切な

Meaning

Willing to help or do favors; accommodating.

Example

The staff at the hotel were very obliging and friendly.

ホテルのスタッフはとても親切で友好的でした。