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。

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 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 adjective /ˌoʊvərˈwiːnɪŋ/

overweening

過度に傲慢な

Meaning

excessively arrogant or prideful

Example

His overweening pride cost him many friends.

彼の過度の誇りは多くの友人を失わせました。

C1 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。

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The company decided to overhaul its outdated computer system.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。

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。

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。

B2 adjective /ˈɒnɡəʊɪŋ/

ongoing

進行中

Meaning

continuing; still in progress

Example

The ongoing project will finish next month.

進行中のプロジェクトは来月終了します。

B1 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 /ˌoʊvərˈsiː/

oversee

監督する

Meaning

to supervise or watch over something; to manage and direct

Example

The manager will oversee the entire construction project.

マネージャーは全体の建設プロジェクトを監督します。

B2 noun /ˈaʊtˌfɪt/

outfit

衣装

Meaning

A set of clothes worn together, often for a particular occasion.

Example

She wore a beautiful outfit to the party.

彼女はパーティーに美しい衣装を着て行った。

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。

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 /ˌoʊpəˈlɛsənt/

opalescent

オパール色の

Meaning

showing or reflecting a milky, iridescent light like an opal

Example

The opalescent sky glowed with shades of pink and blue.

オパレッセントな空はピンクと青の色合いで輝いていた。

C2 noun /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。

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 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。

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。

C2 adjective /ˈɑːsɪˌfaɪd/

ossified

骨に変わった、硬直した

Meaning

Turned into bone or become rigid; unwilling to change.

Example

The company had an ossified management structure that resisted innovation.

その会社は、革新に抵抗する硬直した管理構造を持っていました。

C2 noun /ˈoʊvərlɔːrd/

overlord

領主

Meaning

A ruler, master, or person of great power and authority over others.

Example

The peasants were forced to pay taxes to their overlord.

農民たちは自分たちの領主に税金を払うよう強制されました。

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。

C1 noun /ɒpˈtɒmətri/

optometry

視力検査学

Meaning

The practice or profession of examining the eyes and prescribing corrective lenses.

Example

She studied optometry at the university to become an eye specialist.

彼女は大学でオプトメトリーを学び、眼科専門医になりました。

B2 noun /ˈɒp.tɪ.mɪ.zəm/

optimism

楽観主義

Meaning

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

Example

Her optimism helped her overcome difficult times.

彼女の楽観主義は、困難な時期を乗り越える助けとなりました。

A1 noun /ɒkˈtoʊbər/

october

10月

Meaning

the tenth month of the year in the Gregorian calendar

Example

The weather becomes cooler in October.

10月になると天気が涼しくなります。

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.

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。

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。

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 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 /ˈaʊtlet/

outlet

出口

Meaning

a means by which something is released, expressed, or distributed

Example

Art is a great outlet for emotions.

アートは感情のための素晴らしい出口です。

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。

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。

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。

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。

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。

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 /ˈɒb.stɪ.nə.si/

obstinacy

頑固

Meaning

Stubborn refusal to change one's opinion or chosen course of action, despite attempts to persuade one to do so.

Example

His obstinacy made negotiations difficult.

彼の頑固さは交渉を難しくしました。

B2 noun /ˌɔː.ri.enˈteɪ.ʃən/

orientation

オリエンテーション

Meaning

the process of becoming familiar with a new situation or environment

Example

The company provides an orientation for all new employees.

会社はすべての新しい従業員にオリエンテーションを提供します。

C1 adjective /ˈɑp.ər.ə.tɪv/

Operative

作動中の; 効力を持つ; 仕事をしている; 操作可能な;

Meaning

Functioning; in effect; working; active;

Example

The new safety protocols became operative immediately after the accident.

新しい安全プロトコルは事故後すぐに作動しました。

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。

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。

C2 verb /ˈɑːbdʒərˌɡeɪt/

objurgate

厳しく叱る

Meaning

to scold or rebuke severely

Example

The teacher objurgated the student for being dishonest.

先生は不正直な生徒を厳しく叱った。

B2 noun /ˈoʊ.dər/

Odour

臭い

Meaning

a distinctive smell, especially an unpleasant one

Example

The odour of fresh bread filled the kitchen.

新鮮なパンの臭いがキッチンに広がった。

B1 adjective /əˈrɪdʒ.ɪ.nəl/

Original

元の; 基本的な; 本物の

Meaning

first; fundamental; primary; authentic

Example

This is the original document, not a copy.

これはオリジナルの文書で、コピーではありません。

C2 verb /ˈɔːreɪt/

orate

演説する

Meaning

To speak in a formal, often pompous manner

Example

He began to orate at the ceremony.

彼は式で演説を始めました。

B2 noun ɔːˈɡæn.ɪk fuːdz

organic foods

オーガニック食品

Meaning

Food produced without the use of chemicals such as artificial pesticides, fertilizers, or other artificial agents.

Example

Organic foods are healthier than processed foods.

オーガニック食品は加工食品よりも健康的です。

C1 noun /əbˈzɜːrvətɔːri/

observatory

天文台

Meaning

A building equipped for observing astronomical or meteorological events.

Example

The observatory is open to the public on weekends.

天文台は週末に一般公開されています。

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。

B2 verb /ˌoʊvərˈiːt/

overeat

幸福

Meaning

To eat more food than the body needs.

Example

She tends to overeat when she is stressed.

彼女は賞を受け取ったとき、喜びを隠すことができませんでした。

C1 noun /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。

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。

B1 verb /əbˈzɜːrv/

observe

観察する

Meaning

to watch carefully; to notice or perceive something

Example

Scientists observe the behavior of animals in the wild.

科学者たちは野生動物の行動を観察します。

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。

A1 adjective /oʊld/

old

古い

Meaning

having lived for a long time; not new or young

Example

He still drives his old car.

彼は今でも古い車を運転しています。

C1 noun /ˈɔːrkɪd/

Orchid

オーキッド

Meaning

a diverse family of flowering plants known for their exotic and often fragrant flowers

Example

The white orchid on the windowsill bloomed for months.

窓辺の白いオーキッドは何ヶ月も咲き続けました。

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。

C1 noun /əbˈdʒɛktər/

objector

反対者

Meaning

a person who expresses opposition or disapproval to something

Example

The objector raised his concerns during the town meeting.

反対者は市議会の会議中に自分の懸念を表明しました。

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 /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。

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。

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。

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。

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。

C2 noun ˌɒbfəsˈkeɪʃən

obfuscation

難解化, 混乱

Meaning

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

Example

The obfuscation of the data made it difficult to interpret.

データの難解化により、解釈が困難になりました。

C2 noun /ˈɒn.rʌʃ/

onrush

突発的な流れ

Meaning

A sudden powerful forward or downward rush or flow.

Example

The onrush of water swept away the bridge.

水の突発的な流れが橋を流しました。

C2 adjective /ˈɒkjʊlər/

ocular

眼科の

Meaning

Relating to the eye or vision.

Example

The patient was referred to a specialist for ocular treatment.

患者は眼科専門医に紹介されました。

C1 verb /uːz/

ooze

にじみ出る

Meaning

to slowly flow or leak out through small openings or pores

Example

Blood began to ooze from the small cut.

血が小さな切り傷からにじみ出た。

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。

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 verb /ɔːrˈdeɪn/

ordain

Meaning

To officially make someone a priest or minister; to decree or order something officially.

Example

The bishop will ordain three new priests this Sunday.

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。

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 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。

B2 noun ˈɒksɪdʒən prəˈdʌkʃən

oxygen production

酸素生産

Meaning

The process of generating oxygen through photosynthesis or other means.

Example

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

植物は酸素の生産と生命の維持に不可欠です。

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。

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 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。

A1 pronoun /ˈʌðərz/

others

他の人々

Meaning

people or things distinct from the ones already mentioned or known

Example

I like to spend time with others.

私は他の人々と時間を過ごすのが好きです。

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。

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 /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。

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。

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。

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 adjective /əˈfɪʃəs/

officious

干渉的な

Meaning

Excessively eager to offer unwanted help or advice; meddlesome.

Example

The officious guard kept interrupting the visitors with unnecessary instructions.

その干渉的な警備員は訪問者に不必要な指示で何度も中断させた。

B2 noun /ˈaʊtˌskɜːrt/

outskirt

郊外

Meaning

the outer edge or border of a town or city

Example

They built a new factory on the outskirts of the city.

彼らは街の郊外に新しい工場を建てました。

C1 verb /ˌoʊvərˈruːl/

overrule

却下する

Meaning

to reject or disallow by exercising one's superior authority; to override a decision

Example

The judge overruled the objection from the defense attorney.

裁判官は弁護側の異議を却下した。

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。

C1 noun /ˌɑːk.sɪˈmɔːr.ɒn/

oxymoron

オキシモロン

Meaning

a figure of speech where two contradictory terms are combined

Example

The phrase 'deafening silence' is a classic oxymoron.

「耳をつんざくような静けさ」というフレーズは、典型的なオキシモロンです。

C2 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。

C1 verb /ˌoʊvərˈriːtʃ/

overreach

過剰な努力

Meaning

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

Example

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

その政治家は約束を守れなかったことで過剰な努力をしました。

C1 adjective /aʊtˈmoʊdɪd/

outmoded

時代遅れ

Meaning

No longer in fashion or useful; outdated.

Example

That old computer is completely outmoded.

その古いコンピューターは完全に時代遅れです。

C1 noun /oʊˈmɪʃ.ən/

Omission

省略; 除外

Meaning

the action of excluding or leaving out someone or something; a failure to include

Example

The omission of his name from the list was intentional.

リストから彼の名前を省略することは意図的でした。

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。

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 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。

C1 adjective /əbˈdʒek.ʃən.ə.bəl/

Objectionable

不快な

Meaning

arousing distaste or opposition; unpleasant or offensive

Example

His objectionable behavior made everyone uncomfortable.

彼の不快な行動は、皆を不快にさせた。

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 noun /ˈɔɪ.stər/

Oyster

オイスター

Meaning

a type of shellfish that can be eaten and sometimes contains pearls

Example

She ordered fresh oysters at the seafood restaurant.

彼女はシーフードレストランで新鮮なオイスターを注文しました。

B1 adverb /əˈkeɪʒənəli/

Occasionally

時々; たまに;

Meaning

sometimes; from time to time; not regularly

Example

I occasionally visit my grandmother on weekends.

私は時々週末に祖母を訪ねます。

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。

C1 adjective /əbˈzɜːrvənt/

Observant

観察力のある

Meaning

quick to notice things; watchful; attentive

Example

The observant detective noticed every small detail at the crime scene.

観察力のある探偵は犯罪現場のあらゆる小さな詳細に気づきました。

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。

C1 verb /ˌaʊtˈweɪ/

outweigh

より重要である

Meaning

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

Example

The benefits of the new policy outweigh the risks.

新しい政策の利益はリスクを上回っています。

C2 noun /ˈɔːrdnəns/

ordnance

軍需品

Meaning

Military supplies including weapons, ammunition, and combat equipment.

Example

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

軍隊は都市外の安全な施設に軍需品を保管していた。

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。

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。

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。

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。

B1 adverb /ˈʌðərwaɪz/

Otherwise

さもないと; 他の方法で

Meaning

in a different way; if not; or else; apart from that

Example

Study hard, otherwise you will fail the exam.

一生懸命勉強しなさい、さもないと試験に落ちます。

C2 noun /oʊf/

Oaf

不器用で愚かな、無神経な人

Meaning

a clumsy, stupid, or insensitive person

Example

Don't be such an oaf - handle the dishes carefully!

そんなオーフにならないで – お皿は気をつけて洗って！

C2 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。

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。

B2 noun ˈəʊnəʃɪp

ownership

所有権

Meaning

The act, state, or right of possessing something; legal title to something.

Example

Ownership of resources was crucial.

資源の所有権は重要でした。

B1 noun ˌɔː.ɡən.aɪˈzeɪ.ʃən

organization

組織

Meaning

An organized group of people with a particular purpose, such as a business or government department.

Example

The organization was officially inaugurated in 2024.

その組織は2024年に公式に開設されました。

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 verb /ˈɒs.ɪ.leɪt/

oscillate

二つの点または状態の間で前後に動くまたは揺れる

Meaning

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

Example

The stock market tends to oscillate during uncertain times.

株式市場は不確実な時期に振動しがちです。

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。

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。

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。