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C1 noun /slɪt/

Slit

切れ目
Meaning
a long narrow opening or cut
Example
There was a small slit in the fabric.
生地に小さな切れ目がありました。
C1 verb /bɪˈmoʊn/

bemoan

嘆く
Meaning
To express discontent or sorrow over something.
Example
Critics bemoaned the lack of diversity in the film.
批評家たちは映画の多様性の欠如を嘆いた。
C1 adjective ˈleɪ.tənt

latent

潜在的または隠された
Meaning
Existing but not yet developed or manifested; hidden potential.
Example
His artistic talent remained latent for years.
彼の芸術的な才能は何年もの間潜在的なままでした。
C1 verb /ˈɡɑːbəl/

gobble

ガツガツ食べる
Meaning
to eat something quickly and greedily
Example
The children gobbled their food in minutes.
子供たちは数分で食べ物をガツガツ食べました。
C1 adjective /ˈsɔːsi/

saucy

生意気な
Meaning
Boldly rude, cheeky, or playfully disrespectful.
Example
The child gave a saucy reply to his teacher.
その子は先生に生意気な返事をした。
C1 noun /ˈpɜːrpɪtreɪtər/

perpetrator

犯人
Meaning
a person who commits a harmful, illegal, or immoral act
Example
The police arrested the perpetrator of the crime.
警察は犯罪者を逮捕した。
C1 adjective /ˈviːəmənt/

Vehement

強烈な; 熱烈な; 情熱的な; 活発な
Meaning
showing strong feeling; forceful; passionate; intense
Example
She gave a vehement denial of the accusations.
彼女はその告発に対して強烈に否定した。
C1 noun /wedʒ/

Wedge

くさび; ける; 割る
Meaning
a triangular piece of wood or metal used for splitting or securing; a piece of cheese or cake
Example
He used a wooden wedge to split the log into smaller pieces.
彼は木のくさびを使って丸太を小さな部分に割りました。
C1 adjective /ɪˈstreɪndʒd/

estranged

疎遠
Meaning
no longer close or affectionate with someone; alienated
Example
She felt estranged from her family after the long dispute.
彼女は長い争いの後、家族と疎遠に感じた。
C1 noun /ˈɡreɪ.tər/

Grater

おろし金
Meaning
a kitchen utensil with a rough surface for grating food into small pieces
Example
Use the grater to grate cheese for the pizza.
ピザ用のチーズをおろすためにおろし金を使ってください。
C1 verb /həˈluːsɪneɪt/

hallucinate

幻覚を見る
Meaning
to see, hear, or sense things that are not actually present, often due to illness or drugs
Example
After taking the medicine, he began to hallucinate strange shapes.
薬を飲んだ後、彼は奇妙な形をハルシネイトし始めた。
C1 adjective /ˈkɒnvɛks/

convex

凸状の、外向きに丸みを帯びた
Meaning
curved or rounded outward
Example
The lens has a convex shape to focus light.
レンズは光を焦点を合わせるために凸の形状をしています。
C1 adjective ˌkwɪn.tɪˈsen.ʃəl

quintessential

典型的または最も完璧な例
Meaning
representing the most perfect or typical example of a quality or class.
Example
The artist's work is the quintessential example of modernism.
アーティストの作品はモダニズムの典型的な例です。
C1 noun /luːm/

Loom

織機
Meaning
a machine for weaving cloth; to appear threatening or menacing
Example
The weaver worked at the loom to create beautiful fabrics.
織工は美しい布地を作るために機織り機で働いていました。
C1 noun/verb /ˈkwɒr.i/

quarry

採石場 / 獲物
Meaning
A place where stone or minerals are extracted; also means prey when hunted.
Example
The workers quarried limestone from the hill.
作業員は丘から石灰岩を採掘しました。
C1 verb /ˈkʌl.mɪ.neɪt/

culminate

最高潮に達する
Meaning
To reach the final or climactic stage of a process or activity.
Example
Years of hard work culminated in his success.
長年の努力が彼の成功に集約された。
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 noun ˈkiː.stəʊn ˈspiː.ʃiːz

keystone species

キーストーン種
Meaning
A species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.
Example
Wolves are a keystone species that regulate prey populations.
オオカミは獲物の個体数を調整するキーストーン種です。
C1 noun /ˈbɜːrθraɪt/

birthright

生まれつきの権利
Meaning
A privilege or possession that a person has from birth.
Example
Freedom is considered a birthright of every individual.
自由はすべての個人の生まれつきの権利と見なされます。
C1 noun /ˈten.jər/

Tenure

任期
Meaning
the period of time during which someone holds an office or position
Example
During his tenure as CEO, the company expanded globally.
CEOとしての任期中に、会社は世界的に拡大しました。
C1 noun kɒɡˈnɪʃ.ən

cognition

認知
Meaning
The mental action or process of acquiring knowledge and understanding through thought, experience, and the senses.
Example
Cognition plays a key role in learning.
認知は学習において重要な役割を果たします。
C1 adjective /ˌhɔːrtɪˈkʌltʃərəl/

horticultural

園芸に関連する
Meaning
Relating to the art or practice of garden cultivation and management.
Example
She studied horticultural science at the university.
彼女は大学で園芸学を学びました。
C1 adverb spɒnˈteɪnɪəsli

spontaneously

自発的に
Meaning
In a spontaneous way; naturally and without planning or external cause.
Example
Children learn spontaneously through peer interactions.
子供たちは仲間とのやり取りを通じて自然に学びます。
C1 verb /ˈnɪbəl/

nibble

かじる
Meaning
to take small bites of food
Example
The rabbit nibbled on a carrot.
うさぎはにんじんをかじった。
C1 adjective /ɔːˈtɒn.ə.məs/

autonomous

自律
Meaning
Acting independently or having the freedom to do so.
Example
Autonomous systems ensure greater precision.
自律システムはより高い精度を確保します。
C1 noun /kæʃ/

cache

キャッシュ
Meaning
A hidden storage of items or a high-speed memory in computing.
Example
The hikers found a cache of supplies hidden under the rocks.
ハイカーたちは岩の下に隠された物資のキャッシュを見つけました。
C1 noun /plɔɪ/

ploy

巧妙な策略
Meaning
a clever plan or action designed to gain an advantage
Example
She used a clever ploy to win the debate.
彼女は討論に勝つために巧妙な策略を使いました。
C1 noun /tiˈɑː.rə/

Tiara

ティアラ
Meaning
a jeweled ornamental crown worn on formal occasions
Example
The princess wore a sparkling diamond tiara at the royal ball.
王女は王宮の舞踏会で輝くダイヤモンドのティアラを身に着けていた。
C1 noun /əˌtɜːni ˈdʒɛnərəl/

attorney-general

司法長官
Meaning
The chief legal officer of a state or country.
Example
The attorney-general announced new reforms to strengthen justice.
司法長官は司法の強化のための新しい改革を発表しました。
C1 adjective /ɪnˈsɪdiəs/

insidious

陰険な
Meaning
Proceeding in a gradual, subtle way but with harmful effects.
Example
The insidious spread of misinformation can damage trust.
誤った情報の陰険な広がりは信頼を傷つける可能性がある。
C1 noun ɪnˌɛv.ɪ.təˈbɪl.ɪ.ti

inevitability

避けられない運命
Meaning
The quality of being certain to happen and impossible to avoid or prevent.
Example
The inevitability of change is a part of life.
変化の避けられないことは人生の一部です。
C1 noun /ˈhɜː.mɪt/

Hermit

宗教的な修行として孤独に生きる人；社会から退く人
Meaning
a person living in solitude as a religious discipline; someone who withdraws from society
Example
The old hermit lived alone in a small cabin deep in the mountains, away from civilization.
その老いたハーミットは文明から遠く離れた山の中の小さな小屋で一人で暮らしていた。
C1 verb /ɪmˈpɒvərɪʃ/

impoverish

貧困にする
Meaning
To make someone poor or reduce the quality or richness of something.
Example
The long war impoverished the entire nation.
長い戦争が国全体を貧困にした。
C1 noun /heɪz/

Haze

霞
Meaning
a slight obscuration of the lower atmosphere, typically caused by fine suspended particles; confusion
Example
The morning haze lifted gradually as the sun rose higher in the sky.
朝の霞は徐々に晴れ、太陽が空高く昇るにつれて明らかになった。
C1 verb ˈɛk.spɪ.daɪt

expedite

迅速化する
Meaning
Make an action or process happen sooner or be accomplished more quickly.
Example
The government took steps to expedite the approval process.
政府は承認プロセスを迅速化するための措置を講じた。
C1 adjective /ˈstɪndʒi/

stingy

けち
Meaning
unwilling to spend or give; miserly
Example
He is too stingy to buy a gift for his friend.
彼は友達へのプレゼントを買うにはあまりにけちだ。
C1 verb /əˈfɪliˌeɪt/

affiliate

提携する
Meaning
to officially attach or connect (a group or organization) to a larger body
Example
The school is affiliated with the local university.
その学校は地元の大学と提携しています。
C1 noun /ˌfɜːrmənˈteɪʃən/

fermentation

発酵、酵母または細菌による化学変化
Meaning
a chemical process by which substances like sugar are converted into alcohol or acids using microorganisms
Example
The fermentation of grapes produces wine.
ぶどうの発酵はワインを生産します。
C1 noun dɛkˈstɛr.ɪ.ti

dexterity

器用さ
Meaning
Skill in performing tasks, especially with the hands; mental skill or adroitness.
Example
His dexterity in playing the piano amazed the audience.
ピアノを弾く彼の器用さに観客は驚いた。
C1 noun /ˈbeɪsbɔːrd/

baseboard

基板
Meaning
A narrow board running along the bottom of an interior wall, covering the joint between wall and floor.
Example
The carpenter painted the baseboard white.
大工は基板を白く塗った。
C1 verb /ˈsɛvər/

sever

切る、関係を断つ
Meaning
to cut off or separate, especially by cutting; to end a connection or relationship
Example
He had to sever ties with the company after the dispute.
彼は争いの後、会社との関係を断たなければならなかった。
C1 noun /wæɡ/

Wag

お調子者; いつも冗談を言って楽しむ人
Meaning
a humorous or playful person; someone who enjoys joking around
Example
The class wag always made everyone laugh with his clever jokes.
クラスのワグは、いつも賢い冗談でみんなを笑わせていた。
C1 noun ˌpriːˌɒkjʊˈpeɪʃən

preoccupation

懸念
Meaning
The state of being absorbed in thought; mental distraction.
Example
His preoccupation with work led to neglecting his personal life.
仕事への懸念が彼の個人的な生活を疎かにさせた。
C1 verb /veks/

vex

苛立たせる
Meaning
to annoy or frustrate someone; to cause trouble
Example
The constant noise from construction vexes the residents.
建設の絶え間ない音は住民を苛立たせる。
C1 verb /ˈrɛplɪkeɪt/

replicate

複製する
Meaning
to copy, reproduce, or duplicate something exactly
Example
The scientist tried to replicate the experiment for accuracy.
科学者は実験を正確に再現しようとしました。
C1 noun/verb /ˈfʌrəʊ/

furrow

Meaning
A long narrow trench made in the ground by a plow; to make wrinkles or grooves.
Example
The farmer plowed furrows in the field.
C1 verb /ɡʌʃ/

gush

流れる
Meaning
to flow out suddenly and forcefully, or to express something enthusiastically
Example
Tears began to gush from her eyes.
涙が彼女の目からガシュと流れ出した。
C1 adjective /ʌnˈsɜːrvɪsəbəl/

Unserviceable

使えない; 故障した
Meaning
not in working order; unable to be used; defective
Example
The old computer became unserviceable after the system crash.
古いコンピュータはシステムクラッシュ後、使えなくなりました。
C1 noun /ˈhaɪdəweɪ/

hideaway

隠れ家
Meaning
A place used as a retreat or a place to hide.
Example
The cabin in the woods was their secret hideaway.
森の中の小屋は彼らの秘密の隠れ家だった。
C1 adjective /ˈɜːr.nɪst/

Earnest

真剣な; 本物の; 深い信念を示す
Meaning
sincere; genuine; showing deep and serious conviction
Example
He made an earnest attempt to solve the problem.
彼は問題を解決するために真剣な試みをしました。
C1 verb /ɪˈdʒɛkt/

eject

追い出す
Meaning
to force someone or something out, usually from a place or position
Example
The referee had to eject the player for unsportsmanlike behavior.
レフェリーはアンスポーツマンライクな行為で選手を追い出さなければならなかった。
C1 noun /ˈvæntɪdʒ/

vantage

有利な位置
Meaning
a position or situation that gives an advantage or a good view
Example
From this vantage, we could see the entire valley.
この位置から、私たちは谷全体を見ることができました。
C1 adjective /ˈstoʊɪk/

stoic

冷静な, 無感情な
Meaning
Showing little or no emotion, even in difficult situations.
Example
She remained stoic during the crisis, never showing fear or panic.
彼女は危機の間、冷静で恐怖やパニックを示さなかった。
C1 noun /ˌʌl.tɪˈmeɪ.təm/

Ultimatum

最終通告
Meaning
a final demand or statement of terms, the rejection of which will result in retaliation
Example
The boss gave him an ultimatum: improve or be fired.
上司は彼に最終通告を与えた：改善するか、解雇されるかだ。
C1 noun /rəˈviːn/

ravine

渓谷
Meaning
A deep, narrow valley with steep sides.
Example
The river carved a deep ravine through the mountains.
川は山々を通って深い渓谷を作り出した。
C1 noun /ɪkˈskriːʃən/

excretion

排泄
Meaning
the process of eliminating waste matter from the body
Example
Excretion is vital for maintaining a healthy body.
排泄は健康な体を維持するために不可欠です。
C1 verb /ˈtɛðər/

tether

繋ぐ
Meaning
To tie an animal with a rope or chain so it cannot move far.
Example
The farmer tethered the goat to a post.
農夫はヤギを柱に繋ぎました。
C1 noun /ˈtʃænsələr/

chancellor

学長 / 大臣
Meaning
A senior state or legal official, or the head of a university.
Example
The chancellor delivered an inspiring speech at the graduation ceremony.
学長は卒業式で感動的なスピーチを行いました。
C1 noun /ˈseɪɑːns/

seance

霊的なセッション
Meaning
A meeting where people attempt to communicate with the spirits of the dead.
Example
They held a seance to contact their late grandmother.
彼らは亡くなった祖母と連絡を取るために霊的なセッションを開いた。
C1 adjective /ɪkˈstɛnjueɪtɪŋ/

extenuating

軽減する
Meaning
serving to make a fault or an offense seem less serious
Example
She asked for leniency due to extenuating circumstances.
彼女は軽減する状況のために寛容を求めました。
C1 adjective /ˈɔː.də.bəl/

Audible

聞こえる
Meaning
able to be heard; loud enough to hear
Example
The speaker's voice was barely audible from the back of the large hall.
スピーカーの声は大きなホールの後ろからほとんど聞こえませんでした。
C1 verb /dɪsˈhɑːrtn/

dishearten

落胆させる
Meaning
to cause someone to lose determination or confidence; to discourage
Example
The constant rejection letters began to dishearten the young writer.
継続的な拒否の手紙が若い作家を落胆させ始めた。
C1 adjective /frəˈtɜːrnəl/

fraternal

Meaning
Relating to brothers or brotherhood; friendly and supportive.
Example
The two nations maintain a fraternal relationship.
C1 noun /ˌdiː.kɒmpəˈzɪʃən/

decomposition

分解
Meaning
the process of decaying or breaking down into simpler parts
Example
The decomposition of leaves enriches the soil.
葉の分解は土壌を豊かにします。
C1 verb /ˌdiːˈbʌŋk/

debunk

虚偽を暴露する、神話を打破する
Meaning
Expose the falseness or hollowness of (a myth, idea, or belief).
Example
Scientists debunked the myth that vaccines cause autism.
科学者たちは、ワクチンが自閉症を引き起こすという神話を打破した。
C1 adjective ˈflʌd proʊn

flood-prone

洪水に見舞われやすい
Meaning
Susceptible to flooding; likely to experience floods frequently.
Example
Bangladesh is a flood-prone deltaic nation.
バングラデシュは洪水が発生しやすいデルタ国家です。
C1 adjective /suːˈpɜːr.flu.əs/

superfluous

余分な
Meaning
Unnecessary, especially through being more than enough.
Example
His speech contained too many superfluous details.
彼のスピーチには、余分な詳細が多すぎた。
C1 adjective /ˈærɪd/

arid

乾燥した
Meaning
extremely dry; lacking in interest or excitement
Example
The desert is known for its arid climate.
砂漠はその乾燥した気候で知られています。
C1 verb /ˈwɒloʊ/

wallow

ゴロゴロする, ふける
Meaning
to roll about or indulge oneself in something excessively
Example
The buffalo likes to wallow in the mud on hot days.
バッファローは暑い日には泥の中でゴロゴロするのが好きです。
C1 noun /ˈdʒɛpərdi/

jeopardy

危険
Meaning
Danger of loss, harm, or failure.
Example
His careless driving put everyone in jeopardy.
彼の不注意な運転はみんなを危険にさらした。
C1 adjective /ɪˈrɒtɪk/

erotic

エロティック
Meaning
relating to or tending to arouse sexual desire or excitement
Example
The novel contained several erotic scenes.
その小説にはいくつかのエロティックなシーンが含まれていました。
C1 adjective /ˌpæn.əˈræm.ɪk/

panoramic

パノラマビュー
Meaning
Giving a wide view of an extensive area in all directions.
Example
The hotel offers panoramic views of the ocean.
ホテルは海のパノラミックビューを提供します。
C1 adjective /kəmˈplɪsɪt/

complicit

共犯者 (犯罪で)
Meaning
involved with others in an illegal activity or wrongdoing
Example
He was found complicit in the crime.
彼は犯罪で共犯者として見つかりました。
C1 noun, verb /klɒt/

clot

血栓
Meaning
a thick mass of coagulated liquid, especially blood; to form such a mass.
Example
The doctor removed a blood clot from the patient.
医者は患者から血栓を取り除きました。
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。
C1 noun /ˌɑːr.kəˈpɛl.əˌɡoʊ/

archipelago

群島
Meaning
A group of islands clustered together in a body of water.
Example
Indonesia is an archipelago with thousands of islands.
インドネシアは何千もの島々が集まった群島です。
C1 adjective /ɪˈneɪn/

inane

無意味な, 馬鹿な
Meaning
lacking sense, meaning, or significance; silly or pointless
Example
The movie was criticized for its inane dialogue.
その映画は無意味なセリフで批判された。
C1 verb /ˈmʌtər/

mutter

呟く
Meaning
to speak in a low or barely audible voice, often in dissatisfaction or irritation
Example
He muttered something under his breath as he walked away.
彼は歩きながら何かを呟いた。
C1 noun /mɪˈlɪʃə/

militia

民兵
Meaning
a group of ordinary people who are trained to act as soldiers in emergencies
Example
The village formed a militia to defend against attacks.
村は攻撃から守るために民兵を結成した。
C1 noun /ˈænəɡræm/

anagram

他の単語やフレーズの文字を並べ替えて作られた単語またはフレーズ。
Meaning
A word or phrase formed by rearranging the letters of another word or phrase.
Example
The word 'listen' is an anagram of 'silent'.
'listen' は 'silent' のアナグラムです。
C1 adjective /præɡˈmæt.ɪk/

pragmatic

実用的
Meaning
Dealing with things sensibly and realistically in a way that is based on practical rather than idealistic considerations.
Example
He took a pragmatic approach to solving the financial crisis.
彼は財政危機を解決するために実用的なアプローチを採用しました。
C1 adjective /ˌɪndɪˈsaɪsɪv/

Indecisive

優柔不断な
Meaning
unable to make decisions quickly; hesitant; wavering
Example
She was indecisive about which university to attend.
彼女はどの大学に入学すべきか決めかねていた。
C1 noun /bəˈnɛv.ə.ləns/

benevolence

慈善または優しさ
Meaning
The quality of being well meaning and kindly; the disposition to do good.
Example
His benevolence towards the poor earned him respect.
貧しい人々に対する彼の優しさは、彼に尊敬をもたらしました。
C1 noun /hɒˈstɪləti/

hostility

敵意
Meaning
hostile behavior; unfriendliness or opposition
Example
The negotiations ended in an atmosphere of hostility.
交渉は敵意の雰囲気で終わった。
C1 verb /proʊˈtrækt/

protract

延長する
Meaning
To prolong or extend in time or duration.
Example
Negotiations were protracted for several months.
交渉は数ヶ月間延長されました。
C1 adjective /rɪˈsɔːrs ɪˈfɪʃ.ənt/

resource-efficient

資源効率的
Meaning
Using resources in a way that minimizes waste and maximizes productivity.
Example
Resource-efficient farming conserves water and energy.
資源効率的な農業は、水とエネルギーを節約します。
C1 adjective /ˈflʌstərd/

flustered

動揺した
Meaning
in a state of confusion or agitation
Example
She appeared flustered after being asked so many questions.
彼女はたくさんの質問をされた後、動揺しているように見えました。
C1 noun /ˌdiːpɔːrˈteɪʃən/

deportation

Meaning
The act of expelling a foreigner from a country.
Example
The deportation of hundreds of workers sparked international criticism.
C1 noun /ɪnˈtɛstɪn/

intestine

腸
Meaning
The part of the digestive system where food is digested and absorbed, extending from the stomach to the anus.
Example
The doctor explained how nutrients are absorbed in the small intestine.
医者は、小腸で栄養素がどのように吸収されるかを説明しました。
C1 verb /ˈwɪtl/

whittle

Meaning
to carve or shape something by cutting off small pieces; to gradually reduce
Example
He spent the afternoon whittling a piece of wood into a toy.
C1 noun /ˈdʒækˌfruːt/

Jackfruit

ジャックフルーツ
Meaning
a large tropical fruit with a spiky exterior and sweet flesh inside
Example
The jackfruit is the largest tree fruit in the world.
ジャックフルーツは世界で一番大きな木の果物です。
C1 noun /ˈkɒn.vɔɪ/

convoy

コンボイ
Meaning
a group of vehicles or ships traveling together, often for protection
Example
The military convoy moved through the desert at dawn.
軍のコンボイは夜明けに砂漠を横断しました。
C1 noun /ˈtruː.ənt/

Truant

無断で学校を休む生徒; 責任を回避する人
Meaning
a student who stays away from school without permission; a person who shirks duty
Example
The principal called the parents when their child was caught playing truant.
校長は、子供が学校をさぼっているのを見つけたとき、親に電話をかけました。
C1 adjective /ˌjuːnɪˈsɛljʊlər/

unicellular

単細胞
Meaning
Consisting of a single cell.
Example
Amoebas are unicellular organisms.
アメーバは単細胞生物です。
C1 verb /trænˈspaɪər/

transpire

発生する
Meaning
to occur, happen, or become known
Example
It transpired that he had lied about his age.
彼が年齢について嘘をついていたことが明らかになった。
C1 verb /ˈɪnstɪˌɡeɪt/

instigate

扇動する
Meaning
To bring about or initiate an action, often something negative.
Example
He was accused of instigating the riot.
彼は暴動を扇動したとして告発された。
C1 adjective/verb /ˈsiːzənd/

seasoned

経験豊富な / 味付けされた
Meaning
Experienced in a particular activity; also, flavored with spices.
Example
She is a seasoned teacher with over 20 years of experience.
彼女は20年以上の経験を持つベテランの教師です。
C1 verb /əˈkwɪt/

acquit

無罪を言い渡す
Meaning
to declare someone not guilty of a criminal charge; to conduct oneself in a specified way
Example
The jury decided to acquit the defendant of all charges.
陪審員は被告をすべての告発から無罪にすると決定しました。
C1 verb /məˈruːn/

maroon

無人島に取り残す
Meaning
to leave someone trapped and isolated, especially on an island
Example
The sailors were marooned on a deserted island.
水夫たちは無人島に取り残されました。
C1 noun /ˈpriːˌæmbəl/

preamble

前文
Meaning
a preliminary statement, especially the introduction to a formal document
Example
The preamble of the constitution outlines its guiding principles.
憲法の前文はその基本的な原則を説明しています。
C1 verb /ˈsnɪkər/

snicker

ひそかに笑う
Meaning
to laugh quietly in a disrespectful or mocking way
Example
The students snickered when the teacher made a mistake.
先生が間違えたとき、生徒たちはこっそり笑いました。
C1 noun ˌeə.rəʊ.daɪˈnæm.ɪks

aerodynamics

Meaning
The study of the properties of moving air and the interaction between the air and solid bodies moving through it.
Example
The aerodynamics of an aircraft determines its speed and efficiency.
C1 noun /ˈdʒuː.bɪ.liː/

Jubilee

記念日; 特別な記念式典
Meaning
a special anniversary celebration, especially the 25th, 50th, or 60th anniversary of an important event
Example
The school celebrated its golden jubilee with a grand ceremony.
学校はその金色の記念日を豪華な式典で祝いました。
C1 noun /ˌsɛlfsəˈfɪʃənsi/

Self-sufficiency

自給自足
Meaning
the ability to supply one's own needs without external assistance; independence
Example
The farm achieved complete self-sufficiency in food production.
その農場は食品生産において完全な自給自足を達成しました。
C1 noun /ˈkɔːrdən/

cordon

封鎖線
Meaning
a line or circle of police, soldiers, or guards preventing access
Example
The police set up a cordon around the crime scene.
警察は犯罪現場の周りにコルドンを設置しました。
C1 verb /praʊl/

prowl

こっそり歩く（狩りや探索のため）
Meaning
To move around quietly and secretly, especially while hunting or searching.
Example
The cat prowled around the garden at night.
猫は夜、庭の周りを静かに歩いていた。
C1 adjective /səbˈvɜːrsɪv/

subversive

破壊的
Meaning
seeking or intended to undermine or overthrow an established system or authority
Example
The group was banned for its subversive activities.
そのグループは破壊的な活動のために禁止された。
C1 noun /fɪˈlæn.θrə.pi/

philanthropy

フィランソロピー
Meaning
the desire to promote the welfare of others, often expressed by the generous donation of money to good causes
Example
Philanthropy has helped improve healthcare in many developing countries.
フィランソロピーは多くの発展途上国で医療を改善するのに役立っています。
C1 adjective /əˈθɔːrɪtətɪv/

authoritative

権威的な
Meaning
Having or showing authority; commanding and self-confident; reliable as a source of information.
Example
She spoke in an authoritative tone that silenced the room.
彼女は権威的な口調で話し、部屋を静かにさせた。
C1 noun /ˈblɛm.ɪʃ/

blemish

欠点
Meaning
A small mark or flaw that spoils the appearance of something.
Example
The mirror had a small blemish on the surface.
鏡には表面に小さな欠点があった。
C1 noun /weɪ/

Whey

ホエイ
Meaning
the watery part of milk that separates from the curds when making cheese
Example
Whey protein is popular among athletes and bodybuilders.
ホエイプロテインはアスリートやボディビルダーの間で人気があります。
C1 verb /ˌriːɪmˈbɜːrs/

reimburse

払い戻す
Meaning
to pay back money to someone who has spent it or lost it
Example
The company reimbursed him for travel expenses.
会社は彼に旅行費用を払い戻しました。
C1 adjective /ˈɜːrksəm/

irksome

迷惑的
Meaning
annoying or irritating
Example
Waiting in a long line is one of the most irksome tasks.
長い列に並んでいるのは、最も迷惑な作業の一つです。
C1 adjective /ʌnˈkleɪmd/

Unclaimed

未請求; 未要求; 捨てられたまたは所有者なし
Meaning
not claimed by anyone; not demanded or requested; abandoned or ownerless
Example
The unclaimed luggage was stored in the airport's lost property department.
未請求の荷物は空港の遺失物係に保管されました。
C1 adjective /ˈstɛlər/

stellar

素晴らしい
Meaning
Relating to stars; outstanding or excellent.
Example
She gave a stellar performance in the play.
彼女は劇中で素晴らしいパフォーマンスを披露しました。
C1 noun /ˈkælɪbər/

caliber

カリバー
Meaning
The quality of someone's ability or character; the internal diameter of a gun barrel.
Example
The university attracts students of high caliber.
その大学は高いカリバーの学生を引き付けます。
C1 adjective /æbˈdɑː.mə.nəl/

abdominal

腹部の
Meaning
relating to the abdomen (the part of the body between the chest and pelvis)
Example
He complained of severe abdominal pain.
彼はひどい腹痛を訴えていました。
C1 noun /ɪˌluːmɪˈneɪʃən/

illumination

Meaning
the act of lighting something or making something clear
Example
The street was filled with bright illumination from the lamps.
C1 adjective ɪn ˈfleɪ.ʃə.ner.i

inflationary

インフレ的
Meaning
Characterized by or tending to cause monetary inflation; relating to rising prices.
Example
The government took measures to control inflationary pressures.
政府はインフレ圧力を制御するために措置を講じた。
C1 adjective /ˈθɪŋ.kə.bəl/

thinkable

考えられる
Meaning
Capable of being imagined or conceived; possible to consider or believe
Example
It is hard to believe that such an outcome is even thinkable.
そのような結果が考えられるとは信じがたい。
C1 noun /ˈpɒlɪɡɒn/

polygon

多角形
Meaning
a flat shape with three or more straight sides
Example
The artist drew a colorful polygon on the canvas.
アーティストはキャンバスにカラフルなポリゴンを描きました。