reality
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B1 noun riˈæləti

reality

現実
Meaning
The world or the state of things as they actually exist, as opposed to an idealistic or notional idea.
Example
The reality of the situation was evident.
状況の現実は明らかでした。
C2 adjective /ˈrʌdi/

ruddy

赤ら顔
Meaning
Having a healthy red color in the face.
Example
She had a ruddy complexion from working outdoors.
彼女は外で働いたため、赤ら顔でした。
C1 verb rɪˈplɛn.ɪʃ

replenish

補充する
Meaning
Fill something up again.
Example
Drinking water helps replenish lost fluids in the body.
水を飲むことは、体内で失われた液体を補充するのに役立ちます。
A2 verb /ˈrɛkəɡnaɪz/

recognize

Meaning
To identify someone or something seen before; to acknowledge or accept.
Example
She did not recognize him in the crowd.
C1 noun /ˈrɛdʒɪmənt/

regiment

Meaning
A permanent unit of an army, typically commanded by a colonel and divided into several companies.
Example
The regiment marched proudly through the streets after returning from the mission.
A1 noun /raɪs/

Rice

ご飯
Meaning
a cereal grain that is a staple food in many countries
Example
We eat rice with curry for dinner.
私たちは夕食にカレーと一緒にご飯を食べます。
A2 noun /ˈriːdɪŋ/

reading

読書
Meaning
the action or skill of reading
Example
Reading is one of my favorite hobbies.
読書は私の好きな趣味の一つです。
C1 adjective /rɪˈdʒɛn.ə.rə.tɪv/

regenerative

再生的な
Meaning
Able to restore or renew damaged environments, soil, or resources.
Example
Regenerative farming improves soil health and biodiversity.
再生農業は土壌の健康と生物多様性を改善します。
C1 adjective /ˈræɡ.ɪd/

Ragged

ボロボロの; 破れた; ぼろぼろ
Meaning
torn; tattered; frayed; shabby
Example
The homeless man wore ragged clothes.
ホームレスの男はボロボロの服を着ていた。
A2 verb /roʊl/

roll

転がる
Meaning
to move by turning over and over on an axis
Example
She rolled the ball down the hill.
彼女はボールを丘の下に転がしました。
B2 verb rɪˈstɔːr

restore

復元する
Meaning
To bring back to a former or original state; to reinstate.
Example
Restoring the tradition of student politics is necessary.
学生政治の伝統を復元することが必要です。
C1 adjective /rɪˈvoʊltɪŋ/

revolting

むかつく
Meaning
extremely unpleasant or disgusting
Example
The smell of the garbage was revolting.
ごみのにおいはむかつくほどだった。
B1 adverb /ˈrel.ə.tɪv.li/

Relatively

相対的に
Meaning
in comparison to something else; quite; fairly
Example
The weather is relatively warm today.
今日の天気は相対的に暖かい。
C1 adjective /rɪˈsɛptɪv/

receptive

受容的
Meaning
Willing to listen to or accept new ideas, suggestions, or experiences.
Example
She was receptive to feedback from her colleagues.
彼女は同僚からのフィードバックを受け入れる姿勢を持っていました。
C1 adjective /ˌrɛtroʊˈæktɪv/

retroactive

遡及的
Meaning
applying to a period before it was enacted or established
Example
The new law was made retroactive to cover past cases.
新しい法律は過去のケースをカバーするために遡及的に作られました。
B2 adjective /rɪˈflektɪv/

Reflective

反射的; 思慮深い; 光や画像を反射できる
Meaning
thoughtful; contemplative; able to reflect light or images
Example
After the meeting, he was in a reflective mood.
会議の後、彼は反射的な気分だった。
C1 noun ˈrɔɪəl ˈbɛŋɡəl ˈtaɪɡər

Royal Bengal Tiger

ロイヤルベンガルタイガー
Meaning
A subspecies of tiger found primarily in India and Bangladesh, known for its distinctive orange coat with black stripes.
Example
The Royal Bengal Tiger is an iconic species of the Sundarbans.
ロイヤルベンガルタイガーはスンダルバンスの象徴的な種です。
C1 verb /ˈrɛzəneɪt/

resonate

共鳴する
Meaning
To produce or be filled with a deep, full, and reverberating sound; to evoke a feeling or memory.
Example
Her words resonated with the audience.
彼女の言葉は聴衆に響いた。
B2 verb /rɪˈfreɪn/

refrain

控える
Meaning
To hold oneself back from doing something.
Example
Please refrain from smoking in this area.
このエリアでの喫煙はご遠慮ください。
C1 verb /rɪˈmɪt/

remit

送金する / 免除する
Meaning
To send money in payment or as a gift; to cancel or refrain from exacting a debt or punishment.
Example
He promised to remit the payment by the end of the week.
彼は週の終わりまでに支払いを送金すると約束しました。
C1 noun rɪˈdɛmpʃən

redemption

贖い
Meaning
The action of saving or being saved from sin, error, or evil.
Example
The story highlights the theme of redemption.
その物語は償いのテーマを強調しています。
A2 preposition /riː/

re

について
Meaning
concerning or about (used in formal letters or emails)
Example
The letter was sent re your recent application.
その手紙はあなたの最近の申請について送られました。
B2 verb /ˈræl.i/

rally

Meaning
to come together for a common purpose or to recover strength or spirit
Example
The team rallied after halftime and won the match.
B2 verb /riːˈɔːrɡənaɪz/

reorganize

再編成する
Meaning
to arrange something again in a different way for greater efficiency or order
Example
The manager decided to reorganize the team structure.
マネージャーはチームの構造を再編成することに決めました。
B2 adverb /rɪˈspektɪvli/

Respectively

それぞれ; 指定された順序で; 別々に、そしてすでに言及された順序で
Meaning
in the order given; separately and in the order already mentioned
Example
John and Mary are 25 and 30 years old respectively.
ジョンとメアリーはそれぞれ25歳と30歳です。
A2 noun /rɪˈlɪdʒ.ən/

religion

宗教
Meaning
a system of faith and worship involving belief in a higher power
Example
Freedom of religion is a fundamental human right.
宗教の自由は基本的人権です。
C2 noun /ˈræɡəmʌfɪn/

ragamuffin

ぼろぼろの子供
Meaning
A person, typically a child, in ragged, dirty clothes.
Example
The little ragamuffin begged for food on the street.
小さなぼろぼろの子供が通りで食べ物を求めていた。
B2 noun /ˈraɪdər/

rider

ライダー
Meaning
A person who rides a horse, bicycle, motorcycle, or other vehicle.
Example
The rider fell off the horse.
ライダーは馬から落ちました。
C2 adjective /ˈruːmi/

rheumy

涙目
Meaning
Watery, especially referring to the eyes.
Example
His rheumy eyes showed signs of age and fatigue.
彼の涙目は年齢と疲れの兆しを示していた。
C1 adjective /ˈræspi/

raspy

ハスキー
Meaning
having a harsh, rough, or grating sound
Example
His raspy voice revealed years of smoking.
彼のハスキーな声は喫煙の年数を明らかにした。
B2 verb /rɪˈdʒɔɪs/

rejoice

喜ぶ
Meaning
to feel or show great joy; to celebrate
Example
The family rejoices at the good news.
その家族は良いニュースに喜んでいます。
C1 noun /rɪˈvʌlʃən/

revulsion

嫌悪
Meaning
a strong feeling of disgust or repulsion
Example
She felt revulsion at the sight of the cruel act.
彼女はその残酷な行為を見て嫌悪感を覚えた。
C2 noun /ˌrɛtəˈrɪʃən/

rhetorician

雄弁家
Meaning
A person who is skilled in the art of rhetoric or persuasive speaking/writing.
Example
The rhetorician captivated the audience with his eloquence.
雄弁家はその雄弁さで聴衆を魅了しました。
B1 adjective /rɪˈtaɪərd/

Retired

引退した
Meaning
having left one's job and ceased to work; withdrawn from activity
Example
My retired grandfather enjoys gardening in his free time.
私の引退した祖父は自由な時間に園芸を楽しんでいます。
B2 noun ˌreɪ.di.oʊ.ækˈtɪv.ə.ti

radioactivity

放射性
Meaning
The emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
Example
Radioactivity is used in medical treatments like cancer therapy.
放射性は、がん治療のような医療に用いられている。
C1 noun /rɪˈvɜːrʒən/

reversion

逆転
Meaning
the act of returning to a previous state or condition
Example
The new policy marked a reversion to traditional methods.
新しい政策は伝統的な方法への逆転を意味しました。
C1 noun /ˌrɛkwɪˈzɪʃən/

requisition

要求
Meaning
An official order laying claim to the use of property or materials; a formal demand or request.
Example
The manager submitted a requisition for new office supplies.
マネージャーは新しいオフィス用品のためのレクイジションを提出しました。
C1 noun rɪˈdʒɛn.ər.ə.tɪv ˈfɑːr.mɪŋ

regenerative farming

再生農業
Meaning
Agricultural practices that improve soil health and biodiversity.
Example
Regenerative farming improves soil fertility and biodiversity.
再生農業は土壌の肥沃度と生物多様性を向上させます。
C1 verb /rɪˈvoʊk/

revoke

取り消す
Meaning
To officially cancel or withdraw a decision, privilege, or right.
Example
The government decided to revoke his passport.
政府は彼のパスポートを取り消すことを決定した。
B1 adjective rɪˈlaɪ.ə.bəl

reliable

信頼できる
Meaning
Consistently good in quality or performance; able to be trusted.
Example
Reliable systems ensure efficiency.
信頼できるシステムは効率を確保します。
B1 adjective /ˌriːəˈlɪstɪk/

realistic

現実的
Meaning
having or showing a sensible and practical idea of what can be achieved or expected
Example
She gave a realistic estimate of the project's cost.
彼女はプロジェクトのコストの現実的な見積もりを出した。
C2 adjective /rɪˈfrɪndʒənt/

refringent

屈折性
Meaning
Capable of refracting light or other waves.
Example
The refringent properties of the crystal bent the light into a spectrum.
結晶の屈折性の特性は光をスペクトルに曲げました。
B2 noun /ˈreɪ.zər/

Razor

かみそり
Meaning
a sharp-edged instrument used for shaving hair from the skin
Example
He shaved his beard with a sharp razor.
彼は鋭いかみそりでひげを剃った。
A1 adjective /ˈrɛd.i/

ready

準備ができた
Meaning
Prepared or available for use or action.
Example
She was ready to leave for the airport.
彼女は空港に行く準備ができていた。
C2 adjective /ˈruːbɪkənd/

rubicund

健康的な赤みを帯びた顔
Meaning
Having a healthy reddish complexion.
Example
The old man’s rubicund face showed he was in good health.
その老人の赤みを帯びた顔は、彼が健康であることを示していた。
B2 verb /rɪˈkleɪm/

reclaim

Meaning
To take back or recover something; to restore to a usable state.
Example
The farmer worked to reclaim the barren land.
B1 noun /rɪˈsɔːrs/

resource

資源
Meaning
A supply of materials, money, or assets that can be used when needed.
Example
Water is a vital natural resource.
水は重要な自然資源です。
B2 adjective /rɪˈzɪstənt/

resistant

耐性
Meaning
not affected by something; able to oppose or withstand
Example
This fabric is resistant to water and stains.
この布は水と汚れに強いです。
B1 noun /ˈriː.dʒən/

Region

地域; 区域; 地帯
Meaning
a particular area or part of a country or the world
Example
This region is famous for its wine production.
この地域はワイン生産で有名です。
A1 adjective /raʊnd/

round

丸い
Meaning
having a circular shape; shaped like a sphere or disk
Example
The table was round and had a smooth surface.
テーブルは丸くて、滑らかな表面がありました。
C2 noun /ruːˈeɪ/

roue

感覚的な楽しみを追い求める男
Meaning
A man devoted to a life of sensual pleasure; a debauched man.
Example
The old roue squandered his fortune on gambling and women.
年老いたルーエはギャンブルと女性に財産を浪費した。
B2 noun/verb /rɪˈmɑːrk/

remark

発言
Meaning
something that is said; a comment
Example
She made a remark about the weather.
彼女は天気について発言した。
B2 adjective /raɪp/

Ripe

熟した; 食べる準備ができた
Meaning
fully developed and ready to eat; mature; ready for action or use
Example
The bananas are ripe and ready to eat.
バナナは熟して食べる準備ができています。
B2 adjective /rɪˈfaɪnd/

Refined

洗練された; 精製された
Meaning
elegant and cultured in appearance, manner, or taste; purified
Example
She has very refined taste in art and music.
彼女は芸術と音楽に非常に洗練された趣味を持っています。
C1 adjective /ˌruː.dɪˈmen.tər.i/

Rudimentary

基本的な; 初歩的な; 未発達な; 発展の初期段階にある
Meaning
basic; elementary; undeveloped; in the earliest stage of development
Example
She has only rudimentary knowledge of French.
彼女はフランス語についての初歩的な知識しか持っていません。
C2 noun /ˈrɛdʒɪsaɪd/

regicide

王殺し
Meaning
the act of killing a king
Example
The conspirators were executed for committing regicide.
陰謀者たちは王殺しを犯したため、処刑されました。
C1 noun /rɪˈliːf treɪn/

Relief Train

救援列車
Meaning
a train that carries emergency supplies and aid to disaster-affected areas
Example
The relief train arrived with food and medical supplies for the flood victims.
救援列車は洪水の被害者のために食料と医療物資を運んできました。
A2 verb /rɪˈpiːt/

repeat

繰り返す
Meaning
to say or do something again
Example
Could you please repeat what you just said?
今言ったことを繰り返してくれますか？
C1 noun /ˈrez.ɪ.dənt ˈkəʊ.ɔː.dɪ.neɪ.tər/

resident coordinator

居住者コーディネーター
Meaning
A local administrator or official who coordinates activities in a specific region.
Example
The resident coordinator welcomed all representatives.
居住者コーディネーターは全ての代表者を歓迎しました。
B2 noun /raɪˈnɒs.ər.əs/

Rhinoceros

サイ
Meaning
a large, heavy animal with thick skin and one or two horns on its nose
Example
The rhinoceros charged through the grassland.
サイは草原を突進した。
C1 noun /rɪˈpen.təns/

Repentance

悔い改め
Meaning
the action of repenting; sincere regret or remorse
Example
His genuine repentance moved everyone in the courtroom.
彼の真摯な悔い改めは、法廷のすべての人々を感動させました。
C2 verb /ˈrævəl/

ravel

絡まる / 解く
Meaning
to tangle or complicate; to untangle or unravel depending on context
Example
She began to ravel the loose threads of the sweater.
彼女はセーターのゆるい糸をほどき始めました。
A2 noun rɪˈsɜːtʃ

research

研究
Meaning
The systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions.
Example
Research on radio waves began earlier in India.
ラジオ波の研究はインドで早く始まりました。
B1 adjective /ˈrʊr.əl/

Rural

田舎の
Meaning
relating to the countryside; characteristic of farming or country life
Example
She grew up in a rural area far from the city.
彼女は街から遠く離れた田舎の地域で育ちました。
C2 noun /ˈræŋ.kər/

rancor

憎しみ
Meaning
A feeling of deep and bitter anger or resentment.
Example
There was a rancor between the two rivals that never faded.
二人のライバルの間には、決して消えることのない憎しみがあった。
C1 noun ˌræʃ.ən.əl.ɪˈzeɪ.ʃən

rationalization

合理化
Meaning
The practice of finding reasons for behavior or actions that are not the real reasons.
Example
His rationalization of the mistake was not convincing.
彼の間違いの合理化は説得力がなかった。
C2 verb /ˈrævɪʃ/

ravish

魅了する
Meaning
To fill with intense delight; to captivate or enchant.
Example
The beauty of the sunset ravished the travelers.
夕日の美しさが旅行者を魅了した。
C1 verb /rɪˈsʌsɪteɪt/

resuscitate

Meaning
to revive someone from unconsciousness or apparent death
Example
The doctors tried to resuscitate the patient after the heart attack.
C1 noun /rɪˈteɪnər/

retainer

前払金 / リテイナー
Meaning
a fee paid in advance to secure someone's services, or a device that holds something in place
Example
The lawyer asked for a retainer before taking the case.
弁護士は事件を受ける前に前払い金を要求した。
C1 adjective /rɪˈbel.jəs/

Rebellious

反抗的な; 不従順な; 権威に反発する;
Meaning
defying authority; resisting control; disobedient;
Example
The rebellious teenager refused to follow his parents' rules.
反抗的なティーンエイジャーは、両親の規則に従うことを拒否した。
A2 verb /ˌrɛkəˈmɛnd/

recommend

勧める
Meaning
to suggest or advise something as being good or suitable
Example
I recommend trying the new restaurant downtown.
私はダウンタウンの新しいレストランを試すことをリコメンドします。
C1 noun /ˈrʌp.tʃər/

Rupture

破裂; 関係の断絶
Meaning
breaking or bursting apart; breakdown of relations
Example
The rupture in the pipeline caused a massive oil spill.
パイプラインの破裂が大規模な石油漏れを引き起こしました。
B2 verb /rɪˈɡeɪn/

regain

回復する
Meaning
to get back something that was lost; to recover
Example
He regains his strength after the illness.
彼は病気の後、力を回復する。
C1 noun ˈrez.ɪ.djuːz

residues

残留物
Meaning
A small amount of something that remains after the main part has gone or been taken or used.
Example
The burning process leaves no harmful residues.
燃焼プロセスでは有害な残留物は残りません。
B2 noun/verb rɪˈfɔːm

reform

改革
Meaning
Make changes in (something, typically a social, political, or economic institution or practice) in order to improve it.
Example
Reform in the education system was a priority.
教育システムの改革は優先事項でした。
B2 adverb /ˈraɪtli/

Rightly

正しく; 適切に; 公正に
Meaning
correctly; properly; justly
Example
She rightly pointed out the mistakes in the report.
彼女は報告書の誤りを正しく指摘した。
B2 verb /ˌriː.ɪnˈfɔːrs/

reinforce

強化する
Meaning
To strengthen or support something with additional material, people, or effort.
Example
The teacher used examples to reinforce the lesson.
教師は例を使って授業を強化しました。
C1 verb /ˌriːˈkæl.ɪ.breɪt/

recalibrate

再調整する, 調整し直す
Meaning
To calibrate again or differently; to adjust or correct something based on new information or changed circumstances.
Example
The company had to recalibrate its strategies to adapt to the market.
会社は市場に適応するために戦略を再調整する必要があった。
A2 verb /rɪˈkwaɪər/

require

必要とする
Meaning
to need something; to demand or insist on
Example
This job requires excellent communication skills.
この仕事には優れたコミュニケーションスキルが必要です。
B2 verb /rɪˈzɪst/

resist

抵抗する
Meaning
to oppose or fight against; to withstand
Example
He could not resist the temptation.
彼は誘惑に抵抗できませんでした。
B1 adjective /rɔː/

Raw

生の; 処理されていない; 自然な状態で; 未熟な
Meaning
uncooked; not processed; in natural state; inexperienced
Example
The chef prefers to use raw vegetables in his salads.
シェフはサラダに生野菜を使うのが好きです。
C2 verb /rɪˈpaɪn/

repine

嘆く
Meaning
To feel or express discontent or to long for something.
Example
She did not repine at her misfortune but worked harder to improve her life.
彼女は不幸を嘆かず、より一生懸命に働いて生活を向上させました。
C1 adjective /rɪˈpres.ɪv/

Repressive

抑圧的な
Meaning
restraining freedom or preventing self-expression; oppressive
Example
The repressive government banned all forms of protest.
抑圧的な政府はすべての抗議の形態を禁止しました。
C2 adjective /rɪˈkæl.sɪ.trənt/

recalcitrant

反抗的, 頑固な, 服従しない
Meaning
Having an obstinately uncooperative attitude toward authority or discipline.
Example
The recalcitrant student refused to follow rules.
反抗的な学生は規則に従うことを拒否した。
A2 verb /rɪˈsiːv/

receive

受け取る
Meaning
to get or accept something given; to welcome
Example
She receives a gift from her friend.
彼女は友達から贈り物を受け取ります。
C1 noun /ˌrætɪfɪˈkeɪʃən/

Ratification

承認
Meaning
the action of signing or giving formal consent to a treaty, contract, or agreement
Example
The treaty required ratification by both countries' parliaments.
その条約は両国の議会による批准を必要とした。
C1 noun ˌriː.pɚˈkʌʃ.ənz

repercussions

影響
Meaning
The unintended consequences or effects of an action or event.
Example
The new policy had unintended repercussions on the economy.
新しい政策は経済に予期しない影響を与えました。
B1 verb /rɪˈvjuː/

review

レビュー
Meaning
to examine or assess something again; to write a critical evaluation
Example
I need to review my notes before the exam.
試験前にノートをレビューする必要があります。
B1 noun /rɪˈpɔːtɪŋ/

reporting

報道
Meaning
the act of giving news or information about something
Example
Good reporting is essential for public awareness.
良い報道は公共の認識にとって不可欠です。
C1 verb /ˌriːˈkɒn.stɪ.tʃuːt/

reconstitute

再構成する
Meaning
to restore something to its original form or state; to reassemble
Example
The group was reconstituted after the leader returned.
リーダーが戻った後、グループは再構成されました。
C1 verb /rɪˈmjuːnəreɪt/

remunerate

報酬を支払う
Meaning
To pay someone for services or work done.
Example
The company will remunerate employees fairly for their overtime.
会社は残業に対して従業員に公正な報酬を支払います。
B1 verb /rɪˈper/

repair

修理する
Meaning
to fix something that is broken or damaged
Example
The mechanic will repair the car's engine tomorrow.
メカニックは明日車のエンジンを修理します。
A1 noun /ˈrɛst(ə)rɒnt/

restaurant

レストラン
Meaning
a place where meals are prepared and served to customers
Example
We went to the restaurant for dinner.
私たちは夕食のためにレストランに行きました。
C1 adjective /ˈrɪkɪti/

rickety

ぐらつく
Meaning
Poorly made and likely to collapse; shaky.
Example
They crossed a rickety wooden bridge over the river.
彼らは川を越える不安定な木製の橋を渡りました。
C2 noun /rɪˈfrækʃən/

refraction

屈折
Meaning
The bending of light, sound, or other waves when they pass from one medium to another of different density.
Example
The refraction of light in water makes objects appear bent.
水中の光の屈折により、物体が曲がって見えます。
B2 adjective /ˈrɪɡ.ər.əs/

rigorous

厳格な
Meaning
Extremely thorough and demanding in analysis or practice.
Example
A rigorous study plan helps students achieve better results.
厳格な学習計画は、学生がより良い結果を得るのに役立ちます。
C1 noun /rɪˈsaɪtl/

recital

リサイタル
Meaning
A performance of music, dance, or poetry, usually by a soloist.
Example
She gave a piano recital at the concert hall.
彼女はコンサートホールでピアノのリサイタルを行いました。
A2 noun /ˈrʌnɪŋ/

running

ランニング
Meaning
the action or sport of running
Example
Running every morning keeps me healthy.
毎朝ランニングをすると健康が保たれます。
C1 verb /rɪˈklaɪn/

recline

リクライニングする
Meaning
To lean or lie back in a relaxed position.
Example
She reclined on the sofa with a book.
彼女はソファで本を持ってリクライニングしていた。
C1 adjective /ˈrʌɡ.ɪd/

Rugged

でこぼこで不規則な; 不規則な表面を持つ; 強くて丈夫な
Meaning
rough and uneven; having a rough irregular surface; tough and strong
Example
The hikers crossed the rugged mountain terrain.
ハイカーたちは荒れた山岳地帯を越えた。
C1 noun /ˈrʌfiən/

Ruffian

暴力的な人物; 不良;
Meaning
a violent person, especially one involved in crime; a brutal or lawless person
Example
The ruffian threatened the shopkeeper for money.
不良は店主を金のために脅した。
B2 noun /rɪˈdʒɛkʃən/

rejection

拒絶
Meaning
the action of refusing or dismissing something or someone
Example
Her rejection of the offer surprised everyone.
彼女の提案の拒絶は皆を驚かせた。
B2 noun /ˈraɪfəl/

Rifle

ライフル
Meaning
a gun with a long barrel that is fired from the shoulder
Example
The soldier carried a rifle during the mission.
兵士は任務中にライフルを携帯していました。
B2 noun /rɪb/

Rib

あばら骨
Meaning
one of the curved bones that protect the chest and lungs
Example
He broke his rib in the accident.
彼は事故であばら骨を折った。
B2 verb /rɪˈzɜːv/

reserve

予約する
Meaning
to keep something for future use; to book in advance
Example
I want to reserve a table for dinner.
ディナーのためにテーブルを予約したいです。
C1 noun /riˈæktənt/

reactant

Meaning
A substance that takes part in and undergoes change during a chemical reaction.
Example
Oxygen is a reactant in the process of combustion.
C2 noun /ˈrɛlɪkwɛri/

reliquary

聖遺物を保管する容器
Meaning
a container for holy relics
Example
The ancient reliquary was decorated with gold and precious stones.
古代のレリクエアリは金と貴重な石で飾られていました。
A1 adjective /ˈreɪ.di.əʊ/

radio

ラジオ
Meaning
Relating to radio waves or broadcasting.
Example
FAST is the largest radio telescope in the world.
FASTは世界最大のラジオ望遠鏡です。
C1 verb /rɪˈnɛɡ/

renege

約束を破る
Meaning
to go back on a promise, agreement, or commitment
Example
The company reneged on its promise to increase wages.
その会社は賃金を引き上げるという約束を破りました。
B2 adjective /ˈrændəm/

Random

ランダム
Meaning
without pattern or predetermined order; happening by chance
Example
She selected a random book from the library shelf.
彼女は図書館の棚からランダムに本を選びました。
C1 noun /ˈrɛ.trəʊ.fɪt.ɪŋ/

retrofitting

古いシステムに新しい技術や機能を追加すること
Meaning
The addition of new technology or features to older systems.
Example
The building underwent retrofitting to meet new safety standards.
その建物は、新しい安全基準に適応するためにレトロフィッティングされました。
B2 adjective /ˈroʊlɪŋ/

rolling

転がる
Meaning
moving in gentle undulations; moving forward by turning over and over
Example
They drove through the rolling hills of the countryside.
彼らは田舎の転がる丘を通り抜けました。
B2 noun /ˈreɪ.zən/

Raisin

レーズン
Meaning
dried grape
Example
She added raisins to the oatmeal cookies for extra sweetness.
彼女はオートミールクッキーに甘さを加えるためにレーズンを加えました。
B2 noun /ˈreɪʃoʊ/

ratio

比率
Meaning
a relationship between two numbers showing how many times the first number contains the second
Example
The ratio of boys to girls in the class is 2:1.
クラスでの男の子と女の子の比率は2:1です。
C1 verb /rɪˈlɛnt/

relent

譲歩する、柔らかくなる
Meaning
to become less severe, harsh, or strict
Example
After hours of begging, she finally relented.
何時間もの懇願の後、彼女はついに譲歩した。
C2 noun /ˌræproʊʃˈmɑːn/

rapprochement

関係修復
Meaning
The establishment or resumption of harmonious relations.
Example
The two countries signed an agreement that marked a new rapprochement.
二国は新しい関係修復を示す合意書に署名した。
B1 adverb /ˈriː.zən.ə.bli/

Reasonably

合理的に; 適度に;
Meaning
in a sensible way; fairly; to a moderate degree
Example
The hotel room was reasonably priced for the location.
そのホテルの部屋は場所に対して合理的な価格で提供されていました。
B1 verb /rɪˈleɪt/

relate

関連する
Meaning
to connect or show a link between; to tell a story
Example
She relates her experience to the audience.
彼女は観客に自分の経験を話します。
C1 verb /rɪˈbʌf/

rebuff

拒絶する
Meaning
to reject or refuse in a sharp or abrupt way
Example
She rebuffed his invitation to dinner.
彼女はディナーの招待を断った。
C1 noun /rɪˈbʌtəl/

rebuttal

反論
Meaning
a statement or argument made to oppose or disprove another
Example
Her rebuttal was clear and convincing.
彼女の反論は明確で説得力がありました。
C1 noun /rəʊˈbɒt.ɪk ˈsɜː.dʒər.i/

robotic surgery

ロボット手術
Meaning
Surgery performed with the assistance of robotic systems to enhance precision and reduce invasiveness.
Example
Robotic surgery enhances precision in complex procedures.
ロボット手術は複雑な手順で精度を高めます。