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。

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。

C1 noun /oʊˈveɪʃən/

ovation

拍手

Meaning

an enthusiastic show of approval, especially by clapping hands

Example

The actor received a standing ovation after his performance.

俳優はパフォーマンス後にスタンディングオベーションを受けました。

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。

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 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 /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。

C1 adjective /ˈaʊt.kɑːst/

Outcast

社会的に排除された人

Meaning

rejected by society; excluded person

Example

He felt like an outcast in his new school.

彼は新しい学校でアウトキャストのように感じていた。

C2 adjective /ˌɔːfˈkiː/

off-key

外れた音

Meaning

out of tune; not in accordance with expected standards

Example

The singer was slightly off-key during the performance.

歌手はパフォーマンス中に少し外れた音だった。

B2 verb /ˌoʊvərˈloʊd/

overload

過負荷

Meaning

to load with too much weight or cargo; to give too much work or information

Example

Don't overload the washing machine or it might break down.

洗濯機をオーバーロードしないでください、壊れるかもしれません。

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。

B2 noun /ˈoʊ.vər ɡroʊθ/

Over growth

過剰成長

Meaning

excessive growth beyond normal size; too much development or expansion

Example

The overgrowth of weeds made the garden look untidy.

雑草の過剰な繁茂が庭を乱雑に見せた。

B1 noun /ˈɑp.ʃən/

Option

オプション

Meaning

a thing that is or may be chosen; an alternative course of action

Example

You have the option to work from home or office.

自宅またはオフィスから仕事をするオプションがあります。

C1 noun /ˈɔːr.ə.tɔːr.i/

oratory

弁論術

Meaning

The art of public speaking; skilled and confident delivery of speeches to an audience.

Example

His exceptional oratory skills won him the debate competition.

彼の卓越した弁論術は、ディベートコンペティションで彼に勝利をもたらしました。

B2 noun /ɒdz/

odds

確率

Meaning

the likelihood or probability of something happening; chances for or against something

Example

The odds of winning the lottery are very low.

宝くじに当選する確率は非常に低いです。

A1 adjective/adverb /ˈoʊnli/

only

唯一

Meaning

without others; solely

Example

He is the only person who knows the secret.

彼はその秘密を知っている唯一の人です。

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 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 /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。

C1 adjective /ˌoʊvərˈrɔt/

overwrought

興奮した / 過度に緊張した

Meaning

extremely agitated or nervous; excessively elaborate

Example

She was too overwrought to speak clearly after the accident.

事故後、彼女は興奮しすぎて、はっきりと話すことができなかった。

B1 verb /oʊ/

owe

借りがある

Meaning

to be under obligation to pay or repay; to be indebted

Example

I owe my success to my parents' support.

私は両親の支援のおかげで成功しました。

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。

C1 noun ˌɒp.tɪ.maɪˈzeɪ.ʃən

optimization

最適化

Meaning

Improving processes to increase performance and efficiency.

Example

SEO optimization helps websites rank higher on search engines.

SEO最適化はウェブサイトが検索エンジンでより高いランクを獲得するのを助けます。

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。

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。

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。

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 /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。

B2 adjective /ˈɔː.rəl/

Oral

口頭の; 口に関する

Meaning

spoken rather than written; relating to the mouth

Example

The oral examination will test your speaking skills.

口頭試験はあなたの話す能力をテストします。

C1 verb /ˌoʊvərˈpaʊər/

overpower

圧倒する

Meaning

To defeat or gain control over someone or something by using greater strength or force.

Example

The soldiers managed to overpower the enemy forces.

兵士たちは敵軍を圧倒することができました。

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。

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。

A2 verb /oʊˈbeɪ/

obey

従う

Meaning

to follow orders or instructions; to comply with rules

Example

Children should obey their parents and teachers.

子供たちは親と先生に従うべきです。

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。

C2 verb /ˌoʊvərˈliːp/

overleap

飛び越える

Meaning

To jump over something; to omit or disregard something.

Example

He managed to overleap the fence easily.

彼は簡単にフェンスを飛び越えました。

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。

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。

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。

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。

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 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。

B2 noun ˈɔː.bɪt

orbit

軌道

Meaning

The curved path of a celestial object around a star, planet, or moon.

Example

The satellite maintains its orbit around Earth.

衛星は地球の周りを軌道上に保っています。

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。

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 /oʊˈeɪ.sɪs/

Oasis

オアシス

Meaning

a fertile spot in a desert where water is found; a pleasant refuge

Example

The travelers found an oasis after days in the desert.

旅行者たちは砂漠で数日後にオアシスを見つけました。

C1 verb /ˈɒfsɛt/

offset

相殺

Meaning

To counterbalance or compensate for something.

Example

The company's losses were offset by gains in other departments.

会社の損失は他の部門での利益で相殺されました。

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 verb /ˌoʊvərˈduː/

overdo

やりすぎる

Meaning

to do something too much; to exaggerate or carry to excess

Example

Don't overdo the exercise on your first day at the gym.

初日はジムで運動をやりすぎないでください。

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。

B1 noun /ˌɒpəˈreɪʃən/

operation

手術

Meaning

an act or process of functioning or operating

Example

The hospital performed a successful operation.

病院は成功した手術を行いました。

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。

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 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 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。

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 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 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。

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 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 /əˈpreʃ.ən/

Oppression

抑圧; 虐待; 圧政;

Meaning

cruel or unjust treatment or exercise of authority; the state of being subject to harsh treatment

Example

The people fought against political oppression.

人々は政治的な抑圧に反対して戦った。

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。

B2 verb /ˌoʊvərˈteɪk/

overtake

追い越す

Meaning

to catch up with and pass someone or something; to surpass

Example

The runner managed to overtake his competitor in the final lap.

ランナーは最後の周回で競争相手を追い越しました。

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。

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。

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。

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。

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。

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。

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。

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。

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。

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 adjective ˌɒp.ərˈeɪ.ʃən.əl

operational

運用可能

Meaning

In working order; ready for use.

Example

The space project will be operational by 2025.

宇宙計画は2025年までに運用可能になります。

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 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。

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 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。

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。

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。

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。

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。

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。

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 noun /ˈɔːrɪndʒfɪn ˈleɪbiːoʊ/

Orangefin labeo

オレンジフィンラベオ

Meaning

a freshwater fish species native to South Asian rivers, commonly found in Bangladesh and India

Example

The orangefin labeo is an important food fish in Bangladesh.

オレンジフィンラベオはバングラデシュで重要な食用魚です。

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。

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。

C1 noun /ˈaʊtˌɡroʊθ/

outgrowth

成長

Meaning

something that grows out of something else; a natural development or result

Example

The new policy was an outgrowth of years of debate.

新しい政策は数年の議論の成長でした。

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 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。

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。

C1 verb /ˈɒp.tɪ.maɪz/

optimize

最適化する

Meaning

To make the best or most effective use of a situation, opportunity, or resource.

Example

The company is working to optimize its supply chain.

会社はサプライチェーンの最適化に取り組んでいます。

Meaning

A mythical monster, often depicted as large, hideous, and cruel; metaphorically, a cruel or terrifying person.

Example

The villagers feared the ogre who lived in the dark forest.

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。

C1 noun /ɒpˈtɒmɪtrɪst/

optometrist

オプトメトリスト

Meaning

A healthcare professional who examines eyes and prescribes corrective lenses.

Example

The optometrist prescribed new glasses for her.

オプトメトリストは彼女に新しい眼鏡を処方しました。

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 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。

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。

B2 adjective /ˈɔː.də.li/

Orderly

整然とした; 系統的な; 平和的な

Meaning

well-organized; systematic; peaceful

Example

Please keep your desk orderly and clean.

デスクを整然とした状態できれいに保ってください。

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。

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。

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 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。

C2 adjective /əbˈtruːsɪv/

obtrusive

目障りな

Meaning

noticeable in an unpleasant or unwelcome way; intrusive

Example

The advertisement was so obtrusive that it ruined the user’s experience.

その広告はあまりにも目立ちすぎて、ユーザーの体験を台無しにしました。

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。

A2 noun /ˈɒbdʒɪkt/

object

物体

Meaning

a thing that can be seen and touched

Example

The table is an object in the room.

テーブルは部屋の中の物体です。

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。

B2 adverb /ˈəʊvəli/

overly

過度に

Meaning

to an excessive degree or extent

Example

She was overly concerned about the results.

彼女は結果について過度に心配していた。

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。

C2 noun /ˌɒpəˈrɛtə/

operetta

軽いオペラ

Meaning

a short opera with light and humorous themes

Example

The theater staged a famous operetta by Gilbert and Sullivan.

劇場はギルバートとサリヴァンの有名な軽いオペラを上演しました。

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 /ˈɒbsɪkwi/

obsequy

葬儀

Meaning

A funeral rite, usually used in plural form obsequies.

Example

The village gathered for the obsequy of their beloved teacher.

村人たちは、愛する教師の葬儀のために集まりました。

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。

B2 noun /ɑːks/

Ox

雄牛

Meaning

a large strong animal used for pulling heavy loads or plowing fields

Example

The farmer used an ox to plow the field.

農夫は畑を耕すために雄牛を使いました。

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。