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Becoming outdated or on the way to becoming obsolete.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。

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。

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.

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。

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。

C2 noun /ˈəʊpəs/

opus

創作作品

Meaning

A creative work, especially a large and important piece of music or art.

Example

The composer considered the symphony his greatest opus.

作曲家は交響曲を自分の最も偉大な創作作品と見なしていました。

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。

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。

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。

A1 adverb /wʌns/

Once

一度; 過去に

Meaning

one time only; at some time in the past; formerly

Example

I have been to Paris once in my life.

私は一度だけパリに行ったことがあります。

B1 adjective /ˌoʊld ˈfæʃənd/

old-fashioned

昔風の

Meaning

not modern; belonging to an earlier time

Example

He still wears an old-fashioned hat.

彼は今でも昔風の帽子をかぶっています。

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。

A1 adverb /ˈɔːfən/

often

しばしば

Meaning

frequently, many times

Example

I often visit my grandparents on weekends.

私は週末にしばしば祖父母を訪れます。

A1 adverb /ɔːf/

off

オフ

Meaning

away from a place, position, or time; not functioning

Example

He turned off the light before leaving the room.

彼は部屋を出る前に電気をオフにしました。

B2 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 /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。

A2 noun /ˈɒf.ɪs/

office

オフィス

Meaning

a room or building where people work, usually at desks

Example

She left the office early to attend a family event.

彼女は家族のイベントに出席するために早くオフィスを出ました。

B2 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。

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。

C2 noun /ˈɔɪl.mən/

Oilman

石油業者

Meaning

a person who works in the oil industry; someone who sells oil or petroleum products

Example

The oilman discovered a new oil field in the desert.

オイルマンは砂漠で新しい油田を発見した。

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。

C2 noun /əbˈsɪdiən/

obsidian

オブシディアン (黒いガラスのような火山岩)

Meaning

A hard, dark, glasslike volcanic rock formed by rapid solidification of lava.

Example

The knife was made from sharp obsidian.

ナイフは鋭いオブシディアンで作られていた。

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。

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。

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 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。

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。

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。

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 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。

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 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。

C2 noun /ˈɑːbəlɪsk/

obelisk

オベリスク

Meaning

A tall, four-sided, narrow tapering monument with a pyramid-shaped top.

Example

The ancient Egyptians built obelisks to honor their gods.

古代エジプト人は神々を讃えるためにオベリスクを建てました。

B2 adjective /ˌɑːp.təˈmɪs.tɪk/

optimistic

楽観的

Meaning

hopeful and confident about the future

Example

She is optimistic about the success of her new project.

彼女は新しいプロジェクトの成功に楽観的です。

C2 noun /ˈɔːrzmən/

Oarsman

オールマン

Meaning

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

Example

The experienced oarsman rowed the boat across the river.

経験豊富なオールマンは川を渡るためにボートを漕いだ。

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。

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。

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 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。

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。

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。

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。

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。

A2 modal verb /ɔːt/

ought

べき

Meaning

Used to indicate duty, correctness, or moral obligation.

Example

You ought to respect your elders.

あなたは年長者を尊敬すべきです。

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。

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 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 /ˌoʊvərprəˈdʌkʃən/

overproduction

過剰生産

Meaning

The act of producing more of something than is needed or can be consumed.

Example

The economic crisis was caused by the overproduction of goods.

経済危機は商品の過剰生産によって引き起こされた。

C2 adjective /ˈoʊ.kən/

oaken

オーク材で作られた

Meaning

made of or resembling oak wood

Example

The villagers gathered around the oaken table in the hall.

村人たちはホールの中のオーク材のテーブルの周りに集まりました。

C1 adjective /ˈɒptɪkəl/

optical

光学的

Meaning

related to or used in seeing or sight

Example

The optical illusion fooled everyone at the exhibition.

その光学的錯覚は展示会で皆を騙した。

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.

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 ˌɒb.səˈlɛs.əns

obsolescence

陳腐化

Meaning

The process of becoming obsolete or outdated and no longer used.

Example

The rapid advancement of technology leads to the obsolescence of old devices.

テクノロジーの急速な進歩は古いデバイスの陳腐化を引き起こします。

C1 adjective /ˌɔːrnəˈmɛntl/

ornamental

装飾的な

Meaning

Serving as decoration; decorative rather than functional.

Example

The garden was filled with ornamental plants.

庭は装飾的な植物でいっぱいだった。

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。

B1 adjective /əˈkeɪ.ʒən.əl/

Occasional

偶然の

Meaning

occurring infrequently or irregularly; happening from time to time

Example

She enjoys occasional walks in the park.

彼女は公園で偶然の散歩を楽しんでいます。

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。

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。

B1 verb /əˈkɜːr/

occur

発生する

Meaning

to happen or take place; to be found or present

Example

The accident occurred at the intersection during rush hour.

事故はラッシュアワーの交差点で発生しました。

B2 noun /ˈɔr.fən.ɪʒ/

Orphanage

孤児院

Meaning

an institution for the care and education of children who have lost their parents

Example

The charity built a new orphanage for homeless children.

チャリティーはホームレスの子供たちのために新しい孤児院を建てました。

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。

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。

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。

B2 noun /ˈɒkjʊpənt/

occupant

乗客

Meaning

A person who resides in or is present in a house, vehicle, seat, or place.

Example

The car had three occupants at the time of the accident.

事故の時、車には三人の乗客がいました。

C1 adjective ˈɒk.sɪ.də.tɪv

oxidative

酸化に関連する

Meaning

Related to or caused by oxidation, especially cellular damage from free radicals.

Example

Excess stress can lead to oxidative damage in cells.

過度のストレスは細胞に酸化的な損傷を引き起こす可能性があります。

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。

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 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。

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。

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。

A1 noun/adjective/adverb /ˌaʊtˈsaɪd/

outside

外

Meaning

the external part or surface of something; beyond the boundary

Example

Children were playing outside in the yard.

子供たちは庭で外で遊んでいました。

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。

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 /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。

C2 adjective /ˈoʊdiəs/

odious

忌まわしい

Meaning

extremely unpleasant or repulsive

Example

The dictator was remembered for his odious crimes.

その独裁者は彼の忌まわしい犯罪で記憶されました。

C1 noun /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。

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 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 adjective /ˈɔːrθədɑːks/

orthodox

Meaning

conforming to traditional beliefs or practices

Example

He comes from a very orthodox family.

C1 noun /ˌɑːpərˈtuːnɪst/

opportunist

機会主義者

Meaning

A person who takes advantage of situations for personal gain, often disregarding principles.

Example

He is seen as an opportunist who always puts his interests first.

彼は常に自分の利益を第一に考える機会主義者として見られています。

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。

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。

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。

A1 adjective /ˈʌðər/

other

他の

Meaning

used to refer to something different from the one already mentioned or known

Example

I don't want this one, I will take the other one.

これを欲しくない、他のを取るつもりだ。

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 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。

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。

B2 noun ˈəʊ.və.hed

overhead

間接費

Meaning

Ongoing business expenses not directly attributable to creating a product or service.

Example

The company reduced its overhead to increase profits.

会社は利益を増やすために間接費を削減した。

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。

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。

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。

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。

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 verb, adjective /oʊn/

own

所有する

Meaning

to possess something; belonging to oneself

Example

She owns a beautiful house in the city.

彼女は市内に美しい家を持っています。

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 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。

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.

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 /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。

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。

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 əbˈdʒek.tɪv

objective

目標

Meaning

A thing aimed at or sought; a goal.

Example

The main objective is to test sustainability.

メインオブジェクティブは持続可能性をテストすることです。

A2 verb /ˈɔːfər/

offer

申し出る

Meaning

to present something for acceptance or rejection; to propose

Example

She offered to help with the project.

彼女はプロジェクトを手伝うと申し出た。

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。

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。

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。

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 /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 /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 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。

B2 noun /ˈaʊtskɜːrts/

outskirts

都市の郊外

Meaning

The outer parts of a town or city, away from the center.

Example

They moved to the outskirts of the city for a quieter life.

彼らは静かな生活を求めて都市の郊外に引っ越しました。

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。

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。

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。

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。

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。

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。

B2 noun, verb /ˈaʊtlɔː/

outlaw

Meaning

as a noun: a person who breaks the law and lives outside its protection; as a verb: to make something illegal

Example

The government decided to outlaw the harmful practice.

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。

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。

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。