C1 adjective /ˌəʊvərˈstɪmjʊˌleɪtɪd/

overstimulated

Meaning

Excessively excited or aroused, overwhelmed by too much stimulus.

Example

Overstimulated minds can lead to burnout and decreased productivity.

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。

C1 adjective /ˌaʊtˈlændɪʃ/

outlandish

奇妙

Meaning

Looking or sounding bizarre or unfamiliar; strange.

Example

He wore an outlandish costume to the festival.

彼は祭りに奇妙な衣装を着ていました。

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。

C2 noun /ɒmˈnɪʃəns/

omniscience

全知

Meaning

the state of knowing everything

Example

The novel's narrator has an air of omniscience, revealing every character's thoughts.

小説の語り手は全知の空気をまとい、すべてのキャラクターの考えを明らかにしている。

C2 adjective /ɒmˈnɪʃ.ənt/

Omniscient

全知の

Meaning

having complete knowledge; all-knowing

Example

The narrator in the novel appears to be omniscient, knowing every character's thoughts.

小説の語り手は全知であるかのようで、すべての登場人物の思考を知っている。

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 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 /oʊliˈændər/

Oleander

オレアンダー

Meaning

a poisonous evergreen shrub with clusters of white, pink, or red flowers

Example

The beautiful oleander flowers bloomed in the garden despite their toxic nature.

美しいオレアンダーの花が庭で咲いていましたが、その毒性に関わらず。

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。

C1 adjective /ˌɑːpərˈtuːn/

opportune

適切な瞬間

Meaning

Happening at a suitable or convenient time.

Example

She arrived at an opportune moment to help.

彼女は助けるために適切な瞬間に到着しました。

C2 adjective /ˈɒsiəs/

osseous

骨のような

Meaning

consisting of or turned into bone; bony

Example

The fossil showed osseous structures of the ancient creature.

化石は古代の生物の骨のような構造を示しました。

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 adjective /ˈɒptɪməm/

optimum

最適

Meaning

Most conducive to a favorable outcome; best.

Example

To achieve optimum results, we need to improve efficiency.

最適な結果を得るためには、効率を改善する必要があります。

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。

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。

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。

C2 noun /əbˈstɛtrɪks/

obstetrics

産科

Meaning

The branch of medicine dealing with childbirth and care of women giving birth.

Example

She is studying obstetrics to become a specialist in childbirth.

彼女は産科を学んで、出産専門医になろうとしている。

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。

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。

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。

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。

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。

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。

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。

C2 noun /ˌɑːbdʒərˈɡeɪʃən/

objurgation

厳しい叱責

Meaning

a harsh scolding or strong rebuke

Example

His misconduct earned him a severe objurgation from the manager.

彼の不正行為はマネージャーから厳しい叱責を受けた。

C1 verb əˈblɪt.ə.reɪt

obliterate

完全に破壊する

Meaning

To destroy utterly; wipe out completely, to erase or remove something completely.

Example

The storm obliterated entire villages.

嵐は村全体を完全に破壊しました。

B2 adverb /ˈaʊtraɪt/

Outright

直接に; 完全に; ためらわずに

Meaning

completely; directly; without reservation or concealment

Example

She rejected the proposal outright.

彼女はその提案を直接拒否した。

B2 verb /əbˈteɪn/

obtain

取得する

Meaning

to get or acquire something

Example

You need to obtain a visa before traveling abroad.

あなたは海外に行く前にビザを取得する必要があります。

C1 adjective /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 /ˌaʊtˈspoʊkən/

Outspoken

率直

Meaning

frank; speaking directly

Example

She is known for being outspoken about social issues.

彼女は社会問題について率直に話すことで知られています。

C2 verb /ˈɑːskjʊleɪt/

osculate

キスする

Meaning

To kiss.

Example

They osculated under the mistletoe during the party.

彼らはパーティーの時にヤドリギの下でキスをしました。

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 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。

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 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。

C1 noun /ˈaʊtriːtʃ/

outreach

支援拡大

Meaning

The act of providing services or support to people who might not otherwise have access to them.

Example

The charity launched a new outreach program for the homeless.

チャリティはホームレスのために新しい支援拡大プログラムを開始しました。

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。

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 adverb /ˈoʊpənli/

Openly

率直に; 公然と

Meaning

in a frank and honest way; without concealment; publicly

Example

She spoke openly about her struggles with mental health.

彼女はメンタルヘルスの問題についてオープンに話した。

C2 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 /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。

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。

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.

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。

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。

C1 noun /ˈəʊ.nəs/

onus

責任

Meaning

A duty or responsibility, especially a heavy one.

Example

The onus is on the government to provide relief to the victims.

犠牲者に支援を提供する責任は政府にあります。

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。

C2 adjective /ˈɒf.biːt/

offbeat

風変わり

Meaning

Unusual, unconventional, or different from the norm.

Example

She has a very offbeat sense of humor.

彼女はとても風変わりなユーモアを持っています。

C1 verb /aʊtˈwɪt/

outwit

巧妙に出し抜く

Meaning

to defeat or gain an advantage over someone by being more clever or cunning

Example

The fox managed to outwit the hunters.

キツネは猟師たちを出し抜くことができました。

C1 adjective ˈɒptɪmaɪzd

optimized

最適化, 改善, より効率的

Meaning

Made as fully perfect, functional, or effective as possible; improved to achieve maximum efficiency.

Example

The system has been optimized for faster performance.

システムはより速いパフォーマンスのために最適化されました。

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。

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 /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。

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 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。

B2 noun /ˈɔːrnəmənt/

ornament

装飾品

Meaning

A decorative object that adds beauty to something.

Example

The Christmas tree was decorated with colorful ornaments.

クリスマスツリーはカラフルな装飾品で飾られていました。

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。

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 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。

C2 adjective /ˈoʊdiəs/

odious

忌まわしい

Meaning

extremely unpleasant or repulsive

Example

The dictator was remembered for his odious crimes.

その独裁者は彼の忌まわしい犯罪で記憶されました。

C2 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。

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 adjective /əˈprɛs.ɪv/

Oppressive

抑圧的

Meaning

Harsh and authoritarian; overwhelming; causing distress; tyrannical;

Example

The oppressive heat made it difficult to work outside during the summer.

厳しい暑さは夏の間外で働くのを難しくした。

B2 verb /ˌoʊvərˈwɛlm/

overwhelm

Meaning

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

Example

She was overwhelmed with gratitude after receiving the help.

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 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。

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。

B1 verb /ˈɔːrɡənaɪz/

organize

整理する

Meaning

to arrange systematically; to plan and coordinate

Example

She organized a surprise party for her friend.

彼女は友達のためにサプライズパーティーを企画した。

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。

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 noun /əˈblɪkwɪti/

obliquity

歪み

Meaning

Deviation from moral or usual conduct; indirectness or lack of straightforwardness.

Example

The politician was criticized for the obliquity of his answers.

その政治家は、彼の答えの歪みについて批判された。

B2 noun /ˌɒpəˈzɪʃən/

opposition

反対

Meaning

the action of opposing or resisting something

Example

The opposition to the new law was strong.

新しい法律に対する反対は強かった。

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。

B1 adjective /ˈɔːɡənaɪzd/

organized

組織的な

Meaning

Arranged in a systematic way, especially on a large scale.

Example

An organized approach to work increases productivity and reduces stress.

仕事に対する組織的なアプローチは、生産性を高め、ストレスを減らします。

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 /ˈɑːlɪˌɡɑːrki/

oligarchy

寡頭政治

Meaning

A small group of people having control of a country, organization, or institution.

Example

The nation was ruled by a wealthy oligarchy that controlled all resources.

その国は裕福なオリガーキーによって支配され、すべての資源を支配していました。

C2 noun /ˈɔːrdʒi/

orgy

乱行

Meaning

A wild party involving excessive indulgence, especially of a sexual nature.

Example

The novel described a scandalous orgy in a wealthy mansion.

その小説は、裕福な邸宅でのスキャンダラスな乱行を描いています。

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。

A2 adverb; noun /ˌaʊtˈdɔːrz/

outdoors

屋外で

Meaning

outside a building; the natural environment outside

Example

We spent the whole afternoon outdoors enjoying the fresh air.

私たちは午後ずっと屋外で新鮮な空気を楽しみました。

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 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。

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。

C2 adjective /əˈrækjələr/

oracular

神託のような

Meaning

Resembling an oracle; giving wise, mysterious, or prophetic statements

Example

Her oracular words left the audience deep in thought.

彼女の神託のような言葉は、観客を深く考えさせた。

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 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。

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。

C1 verb /aʊtˈlɪv/

outlive

より長生きする

Meaning

to live longer than someone or something else

Example

She outlived all her siblings.

彼女はすべての兄弟姉妹より長生きしました。

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 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。

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。

C2 noun /ɔːrˈθɑːɡrəfi/

orthography

正書法

Meaning

The conventional spelling system of a language.

Example

English orthography can be confusing for learners.

英語の正書法は学習者にとって混乱を招くことがあります。

A2 adjective /əˈlɪmpɪk/

olympic

オリンピック

Meaning

related to the Olympic Games, a major international sporting event

Example

She trained hard to compete in the Olympic Games.

彼女はオリンピックに出場するために一生懸命トレーニングをしました。

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。

C2 noun /ɔːˈreɪʃən/

oration

演説

Meaning

A formal speech, especially one given on a ceremonial occasion

Example

The president delivered an inspiring oration.

大統領は感動的な演説を行いました。

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。

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 verb /ˈɔːstrəˌsaɪz/

ostracize

追放する

Meaning

to exclude someone from a group or society; to banish or shun

Example

After the scandal, he was ostracized by his former colleagues.

スキャンダル後、彼は元同僚に追放された。

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。

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。

C1 adjective /ɔːˈneɪt/

ornate

華やかな

Meaning

elaborately or highly decorated

Example

The palace hall was filled with ornate furniture and paintings.

宮殿のホールは華やかな家具と絵画でいっぱいだった。

C2 adjective /ˈoʊ.pən ˈhæn.dɪd/

Open-handed

寛大な; 自由な

Meaning

Generous; liberal; giving freely;

Example

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

彼は自分の金に非常に寛大で、いつも困っている人々を助けています。

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。

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。

C2 noun /oʊˈbeɪsəns/

obeisance

敬意

Meaning

A gesture of respect such as a bow or curtsy.

Example

They bowed in obeisance to the king.

彼らは王に対して敬意を示すためにお辞儀をした。

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 verb /ˌoʊvərˈʃædoʊ/

overshadow

覆い隠す

Meaning

to appear more important or significant than something else, reducing its impact

Example

The scandal overshadowed his achievements.

スキャンダルは彼の業績を影にしました。

C2 noun /ˈɒfərtɔːri/

offertory

奉納

Meaning

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

Example

The offertory was taken during the Sunday service.

日曜日の礼拝中に奉納が取られました。

C2 noun /ˈoʊɡər/

ogre

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.

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 /ˈoʊ.kəm/

oakum

古いロープの繊維

Meaning

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

Example

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

船大工たちは木の板の隙間を塞ぐためにオーカムを使いました。

C2 noun /ˌɔːrdɪˈneɪʃən/

ordination

任命式

Meaning

The ceremony of conferring holy orders or official religious authority.

Example

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

教会は新しい神父の任命のために特別なサービスを行いました。

A2 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。

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。

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。

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。

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。

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 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。

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。

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。