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。

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。

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。

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。

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。

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。

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。

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。

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 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。

C2 noun /ˈɔːfəl/

offal

内臓

Meaning

the internal organs and entrails of an animal used as food; waste parts

Example

The butcher prepared sausages using pork offal.

肉屋は豚の臓物を使ってソーセージを作った。

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。

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 /ˈaʊtpoʊst/

outpost

前哨基地

Meaning

A small military camp or position at some distance from the main force, used especially as a guard.

Example

The soldiers were stationed at a remote outpost.

兵士たちは遠隔地の前哨基地に配置されました。

C1 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。

B2 adverb /ˈɒdli/

oddly

奇妙に

Meaning

in a strange or unusual way; unexpectedly

Example

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

奇妙に、彼は悪い知らせにも動揺していなかった。

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。

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。

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。

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。

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。

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。

C2 verb /oʊˈpaɪn/

opine

意見を述べる

Meaning

to express an opinion or belief

Example

The professor opined that the policy would fail.

教授はその政策が失敗するだろうと述べました。

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。

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。

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 /ˈoʊ.pən ˈhɑrt.ɪd/

Open-hearted

オープンハート; 寛大で誠実; 心温かく受け入れる;

Meaning

Kind and generous; sincere and honest; warmly receptive;

Example

She welcomed the strangers with an open-hearted smile and invited them for dinner.

彼女は見知らぬ人々を心温かい笑顔で迎え、夕食に招待した。

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。

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。

B2 noun ˈoʊzoʊn dɪˈpliʃən

ozone depletion

オゾン層の減少

Meaning

The reduction in the amount of ozone in the Earth's stratosphere, leading to increased UV radiation.

Example

Ozone depletion increases UV radiation.

オゾン層の減少はUV放射線を増加させます。

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。

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。

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。

B1 adjective, adverb /ˈoʊvərɔːl/

overall

全体的に

Meaning

in general or as a whole

Example

Overall, the project has been successful.

全体的に、プロジェクトは成功しました。

B1 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。

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。

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。

C1 noun /ˈɑːdəsi/

odyssey

長い旅

Meaning

a long, adventurous journey; a series of experiences

Example

Her career has been an odyssey of challenges and achievements.

彼女のキャリアは挑戦と成果の長い旅でした。

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 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 /ˌəʊvərɪksˌplɔɪˈteɪʃən/

overexploitation

過剰搾取

Meaning

The unsustainable use of natural resources at a rate that exceeds their ability to regenerate, leading to depletion and environmental degradation.

Example

Overexploitation of natural resources leads to environmental degradation.

自然資源の過剰搾取は環境の悪化を引き起こします。

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 /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。

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 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 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 /ˈaʊt.kʌm/

Outcome

結果; 結末;

Meaning

the result or consequence of an action or situation; the final product

Example

The outcome of the election surprised everyone.

選挙の結果は皆を驚かせました。

B2 noun /ˈaʊtˌsɛt/

outset

開始

Meaning

the beginning or start of something

Example

From the outset, the project seemed ambitious but achievable.

最初から、プロジェクトは野心的だが達成可能に見えました。

C2 noun /ˌɔːrnɪˈθɑːlədʒi/

ornithology

鳥類学

Meaning

the scientific study of birds

Example

She pursued ornithology to understand the migration patterns of birds.

彼女は鳥の移動パターンを理解するためにオルニソロジーを追求しました。

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 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。

A2 noun /ˈɒm.lət/

Omelet

オムレツ

Meaning

a dish made from beaten eggs cooked in a frying pan and often folded around a filling

Example

She made a cheese omelet for breakfast.

彼女は朝食にチーズオムレツを作った。

B1 adjective /ˈaʊtər/

outer

外部

Meaning

situated on or toward the outside; external

Example

The outer layer of the jacket is waterproof.

ジャケットの外側の層は防水です。

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 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 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。

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 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。

C1 adjective /ˌaʊt əv ðə ˈweɪ/

out-of-the-way

人里離れた場所

Meaning

remote or unusual; not in a convenient or usual location

Example

They stayed in an out-of-the-way village.

彼らは人里離れた村に滞在しました。

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。

B1 noun ˈɒk.sɪ.dʒən

oxygen

酸素。無色無臭の気体で、生命に不可欠な成分です。

Meaning

A colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.

Example

Oxygen is vital for life.

酸素は生命にとって不可欠です。

B2 verb /əˈfend/

offend

侮辱する

Meaning

to cause displeasure or resentment; to hurt someone's feelings

Example

His rude comments offended many people at the meeting.

彼の無礼なコメントは会議で多くの人々を怒らせました。

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。

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。

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 /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。

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。

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。

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 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 /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。

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 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。

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 noun /ˌɒk.sɪ.dʒɪˈneɪ.ʃən/

oxygenation

酸素供給または治療

Meaning

The process of supplying or treating with oxygen.

Example

Deep breathing exercises improve oxygenation of the body.

深呼吸の練習は身体の酸素供給を改善します。

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！

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.

C1 noun ˈaʊt.sɔːr.sɪŋ

outsourcing

アウトソーシング

Meaning

The practice of having certain job functions done outside a company instead of having an in-house department or employee handle them.

Example

Many companies use outsourcing to reduce labor costs.

多くの企業はコスト削減のためにアウトソーシングを利用しています。

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 adjective /əbˈstrʌk.tɪv/

Obstructive

妨害的な

Meaning

deliberately creating difficulties or preventing progress; hindering or blocking something

Example

The obstructive policies hindered economic growth.

妨害的な政策は経済成長を阻害した。

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。

C1 noun /əˈkɜr.əns/

Occurrence

出来事

Meaning

an instance or event of something happening; the fact of occurring

Example

The occurrence of earthquakes is common in this region.

この地域では地震の出来事が一般的です。

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。

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。

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。

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。

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。

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。

珍奇な現象

Meaning

something that is strange or unusual; a peculiar trait

Example

His habit of sleeping standing up was considered an oddity.

彼の立って寝る習慣は珍奇な現象と見なされていました。