revolutionary breakthrough
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C1 noun /ˌrev.əˈluː.ʃən.ər.i ˈbreɪk.θruː/

revolutionary breakthrough

革命的な発見
Meaning
A sudden, dramatic, and important discovery or development that changes everything.
Example
Robotic surgery is a revolutionary breakthrough in healthcare.
ロボット手術は医療分野での革命的な発見です。
C2 adjective /ˈrɛkriənt/

recreant

臆病な, 裏切り者
Meaning
cowardly or unfaithful to duty
Example
The recreant soldier abandoned his post in fear.
その臆病な兵士は恐怖で自分のポストを放棄した。
B1 noun /rɪˈleɪ.ʃən/

Relation

関係; 親戚
Meaning
the way in which two or more people or things are connected; a family member
Example
They have a strong business relation that has lasted for years.
彼らは長年続く強力なビジネス関係を持っています。
B2 adjective /rɪˈzɪl.i.ənt/

resilient

回復力のある
Meaning
Able to withstand or recover quickly from difficult conditions.
Example
Resilient materials ensure durability.
回復力のある素材は耐久性を保証します。
C2 adjective /rɪˈfjuː.tə.bəl/

Refutable

反証可能
Meaning
capable of being proven wrong or false; able to be disproved
Example
His theory was refutable because it could be tested experimentally.
彼の理論は実験的にテストできるので反証可能でした。
C2 verb /rɪˈɡeɪl/

regale

楽しませる
Meaning
To entertain or amuse someone with stories, food, or drink.
Example
He regaled us with stories of his travels around the world.
彼は世界中を旅した話で私たちを楽しませました。
B2 noun /ˈriːzənɪŋ/

reasoning

推論
Meaning
the process of thinking about something in a logical way in order to form a conclusion or judgment
Example
Her reasoning for leaving was clear and logical.
彼女の出発の推論は明確で論理的でした。
B2 noun /ˈrɪdəl/

Riddle

謎
Meaning
a question or statement intentionally phrased so as to require ingenuity in ascertaining its answer or meaning; a puzzle
Example
The ancient riddle stumped all the scholars for years.
その古代の謎は何年もの間、すべての学者を困らせました。
A2 verb /ˈriːəlaɪz/

realize

気づく
Meaning
to become aware of; to understand clearly; to achieve or make real
Example
I didn't realize how late it was until I checked the clock.
時計を見るまで、こんなに遅いとは気づかなかった。
B2 noun /rɪˈfɔːr.mər/

Reformer

改革者
Meaning
a person who works to bring about positive changes in society or institutions
Example
The social reformer dedicated her life to improving education for all children.
社会的な改革者は、すべての子供たちの教育を改善するために自分の人生を捧げました。
C2 adjective /ˈrɛd.ələnt/

redolent

Meaning
having a strong pleasant smell; strongly reminiscent or suggestive of something
Example
The kitchen was redolent of spices and fresh herbs.
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 adjective /ˈriːɡəl/

regal

王室の
Meaning
Resembling or fit for a king; majestic or royal.
Example
The queen entered the hall with a regal presence.
女王は王室のような存在感でホールに入った。
B2 verb /rɪˈzɛmbəl/

resemble

似ている
Meaning
to look like or be similar to something or someone
Example
She resembles her mother in both appearance and mannerisms.
彼女は見た目と仕草の両方で母親に似ています。
C1 noun /ruːz/

Ruse

策略; 騙し
Meaning
an action intended to deceive someone; a trick or stratagem
Example
The thief used a clever ruse to distract the guard.
泥棒は警備員を惑わすために巧妙な策略を使った。
C2 verb /rɛtʃ/

retch

幸せ
Meaning
to make the sound and movement of vomiting without bringing anything up
Example
The smell of spoiled food made him retch violently.
賞を受け取った時、彼女は喜びを隠すことができませんでした。
A1 verb /rɪˈmembə/

remember

覚える
Meaning
to bring a past event back into one's mind; to keep in memory
Example
I remember my first day at school.
私は学校の最初の日を覚えています。
C2 noun /ˌrɛtroʊˈɡrɛʃən/

retrogression

後退
Meaning
a return to a worse or less developed state
Example
The country experienced economic retrogression after the crisis.
国は危機後、経済的な後退を経験しました。
C2 noun /rɪˈkɒɡnɪzəns/

recognizance

法的義務
Meaning
A legal obligation or bond entered into before a court, especially to ensure future appearance.
Example
He was released on his own recognizance.
彼は自分の法的義務で釈放されました。
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。
C2 noun /rɪˈɡætə/

regatta

ボート競走
Meaning
A sporting event consisting of a series of boat or yacht races.
Example
The annual regatta attracted competitors from around the world.
毎年のレガッタは世界中から競技者を引き付けた。
C1 noun /ˈrɒstrəm/

rostrum

演壇
Meaning
A raised platform for speakers, performers, or leaders.
Example
The politician delivered a speech from the rostrum.
政治家は演壇から演説を行いました。
C1 noun /ˌriː.əˈdʒʌst.mənt/

readjustment

Meaning
The act of changing or correcting something again to make it suitable or balanced.
Example
After moving to a new city, he went through a period of readjustment.
A2 noun /ruːl/

rule

規則
Meaning
an accepted principle or instruction that states what is allowed or what must be done.
Example
There are strict rules about safety in the lab.
実験室には安全に関する厳しい規則があります。
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。
B2 verb /rɒt/

rot

腐る
Meaning
to decay or decompose; to become corrupt
Example
The fruit will rot if left in the sun.
果物は日光に当たると腐ります。
B1 verb /rɪˈliːs/

release

解放する
Meaning
to set free; to allow something to escape or go away
Example
The prisoner was released after ten years.
囚人は10年後に解放されました。
C1 verb /rɪˈzaʊnd/

resound

反響する
Meaning
To fill a place with sound; to be celebrated or talked about widely.
Example
The hall resounded with applause.
ホールは拍手で反響しました。
C1 verb /ˈreɪdieɪt/

radiate

放射する
Meaning
to emit energy or light; to spread out from a center
Example
The fireplace radiates warmth throughout the room.
暖炉は部屋全体に暖かさを放射します。
C1 verb /ˌriːəˈdʒʌst/

readjust

再調整
Meaning
To change or move something again in order to achieve a better fit, condition, or balance.
Example
He readjusted the chair to make it more comfortable.
彼は椅子をもっと快適にするために再調整しました。
C2 noun /roʊˈtʌn.də/

rotunda

円形の建物
Meaning
a large circular building or hall, often with a dome
Example
Tourists gathered inside the grand rotunda of the capitol.
観光客は議会堂の壮大なロタンダの中に集まりました。
C2 noun /ˌrep.ɑːˈtiː/

Repartee

機知に富んだ返答
Meaning
conversation or speech characterized by quick, witty comments or replies
Example
The dinner party was filled with brilliant repartee between the guests.
ディナーでは、ゲスト間で素晴らしい機知に富んだ返答が交わされていました。
B2 noun /rɪˈmaɪndər/

reminder

リマインダー
Meaning
something that helps you remember a fact, event, or action that you need to do or recall
Example
He set a reminder to call his mother on her birthday.
彼は母親の誕生日に電話するためにリマインダーを設定しました。
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。
B1 adverb /ˈruːdli/

Rudely

失礼に
Meaning
in an impolite or discourteous manner
Example
He rudely interrupted the speaker during the presentation.
彼はプレゼン中に話者を失礼に遮った。
B2 noun /rɪˈfreʃ.mənt/

Refreshment

軽食
Meaning
food and drink that is served as a light meal; something that refreshes
Example
We served light refreshments after the meeting.
会議の後、軽食を提供しました。
B2 verb /rɪˈteɪn/

retain

保持する
Meaning
to keep possession of something
Example
The company decided to retain its experienced employees.
会社は経験豊富な従業員を保持することに決めました。
C1 adjective /riˈæk.tɪv/

Reactive

反応的; 化学的に活発
Meaning
responding to situations rather than initiating them; chemically active
Example
The company took a reactive approach to customer complaints.
会社は顧客の苦情に反応的なアプローチを採用しました。
B2 adjective /ˈruː.tɪd/

Rooted

根付いた
Meaning
deeply established; firmly fixed
Example
His beliefs are deeply rooted in tradition.
彼の信念は伝統に深く根ざしている。
B1 noun /ˈreɪn.dɪər/

Reindeer

トナカイ
Meaning
a large deer with branched horns that lives in cold northern areas
Example
Santa's reindeer pulled his sleigh across the sky.
サンタのトナカイは空を越えてソリを引きました。
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。
B1 noun /ˌrɛdʒɪˈstreɪʃən/

registration

登録
Meaning
the action or process of enrolling or signing up for something
Example
The registration for the event will close tomorrow.
イベントの登録は明日締め切りです。
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。
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。
B2 adjective /ˈrɒt.ən/

Rotten

腐った; 悪い
Meaning
decayed; spoiled; bad
Example
The apple is rotten and should be thrown away.
リンゴは腐っていて、捨てるべきです。
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。
C2 adjective /ˈrɛpərəbəl/

reparable

修理可能
Meaning
able to be repaired or fixed
Example
The damage to the car was serious but still reparable.
車の損傷は深刻だったが、それでも修理可能だった。
C2 noun /rɪˈsɪdɪˌvɪzəm/

recidivism

Meaning
The tendency of a convicted criminal to reoffend or relapse into criminal behavior.
Example
The government introduced new programs to reduce recidivism among former inmates.
B2 verb /roʊm/

roam

歩き回る
Meaning
to walk or travel without a specific destination; to wander
Example
Wild animals roam freely in the forest.
野生動物は森の中を自由に歩き回っています。
B2 noun /ˈrɛzərvwɑːr/

reservoir

貯水池
Meaning
A large natural or artificial lake used as a source of water supply.
Example
The city built a new reservoir to ensure enough drinking water for its residents.
その都市は住民に十分な飲料水を確保するために新しい貯水池を建設した。
A2 noun /ˈruːlər/

ruler

支配者; 定規
Meaning
A person who governs or controls a country; a straight-edged tool used for measuring or drawing lines
Example
The ruler drew a straight line on the paper while the king was a powerful ruler of his kingdom.
ルーラーは紙にまっすぐな線を引き、王は自分の王国の強力な支配者でした。
C1 noun /ˈræʃən/

ration

配給
Meaning
a fixed amount of something, especially food, officially allowed to each person
Example
During the war, each family received a weekly ration of rice.
戦争中、各家族は毎週一定量のご飯を配給されました。
B2 verb rɪˈzaɪn

resign

辞任する
Meaning
Voluntarily leave a job or other position.
Example
Ministers were forced to resign.
大臣たちは辞任を余儀なくされました。
C2 noun /ˈrɒndoʊ/

rondo

音楽作品（繰り返しのテーマを持つ）
Meaning
a musical composition with a recurring leading theme
Example
The pianist ended the recital with a lively rondo.
ピアニストは生き生きとしたロンドでリサイタルを終えました。
C2 adjective /rɪˈmiːdiəbl/

remediable

修正可能
Meaning
capable of being corrected or cured
Example
The mistake was serious but still remediable.
その誤りは重大でしたが、まだ修正可能でした。
B2 noun /ˌriːprəˈdʌkʃən/

reproduction

再生, 繁殖
Meaning
The process of producing offspring; the act of copying or duplicating.
Example
The textbook included a detailed diagram of human reproduction.
教科書には人間のリプロダクションの詳細な図が含まれていました。
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。
C2 adjective /rɪˈtɪkjʊlət/

reticulate

網状
Meaning
Having a net-like pattern or structure.
Example
The leaf had a reticulate pattern of veins.
葉は網目模様の静脈がありました。
B2 noun /rɪˈzembləns/

Resemblance

類似
Meaning
the state of being alike or similar; similarity in appearance or character
Example
There's a strong resemblance between the two sisters.
二人の姉妹の間には強い類似があります。
B2 noun /ˈrɒbəɹi/

robbery

強盗
Meaning
the crime of stealing from someone or somewhere using force or threat
Example
The police are investigating the robbery at the local store.
警察は地元の店での強盗事件を調査しています。
C1 noun /ˈrɒndɪvuː/

rendezvous

会合
Meaning
a meeting or appointment at an agreed time and place
Example
They arranged a secret rendezvous at the café.
彼らはカフェで秘密の会合を手配しました。
A2 adverb /ˈrɑː.ðər/

Rather

むしろ; ～の代わりに;
Meaning
to some extent; instead; preferably
Example
I would rather stay home than go to the party.
パーティーに行くよりも家にいる方がいい。
C1 adjective rɪˈsɛʃ.ən.er.i

recessionary

不況に関する
Meaning
Relating to or characterized by economic recession.
Example
Governments introduce policies to counter recessionary effects.
政府は景気後退の影響に対処するために政策を導入しています。
B2 noun /ˈruːmər/

rumor

噂
Meaning
a currently circulating story or report of uncertain or doubtful truth.
Example
There’s a rumor that the company will merge next year.
来年、会社が合併するという噂があります。
B2 adverb /rɪˈpɔːtɪdli/

reportedly

報告によると
Meaning
according to what is said or believed, although not confirmed
Example
The company has reportedly agreed to the new terms.
その会社はreportedly新しい条件に同意しました。
B2 adjective /rɪˈmuːvəbəl/

removable

取り外し可能な
Meaning
able to be removed or taken away
Example
This phone has a removable battery.
この電話には取り外し可能なバッテリーがあります。
C1 noun rɪˈdʌndənsi

redundancy

冗長性、過剰
Meaning
The state of being not or no longer needed or useful; superfluousness.
Example
The redundancy in the company's workforce led to many layoffs.
会社の労働力の冗長性は多くの解雇を引き起こしました。
C1 adjective /ˈroʊtəri/

rotary

回転式
Meaning
Relating to or characterized by rotation; revolving around an axis.
Example
The machine uses a rotary engine to function efficiently.
その機械は効率的に動作するためにロータリーエンジンを使用しています。
C1 noun /rɪˈpɔːrtɪʒ/

reportage

報道
Meaning
the act of reporting news or describing events in the media
Example
The magazine is known for its detailed reportage of political issues.
その雑誌は政治問題に関する詳細な報道で知られています。
B1 noun /roʊˈmæns/

Romance

ロマンス
Meaning
a feeling of excitement and mystery associated with love; a love affair or relationship
Example
Their romance began when they met at the university library.
彼らの恋愛は、大学の図書館で出会ったときに始まった。
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。
B2 verb /rɪˈliːv/

relieve

Meaning
to make pain, distress, or difficulty less severe or serious
Example
The medicine helped relieve his headache.
B2 noun /ˌref.jʊˈdʒiː/

Refugee

難民
Meaning
a person who has been forced to leave their country in order to escape war, persecution, or natural disaster
Example
The refugee camp provided temporary shelter for thousands of displaced families.
難民キャンプは、何千人もの避難した家族に一時的な避難所を提供しました。
B2 noun /ˈraɪvəl/

Rival

ライバル; 競争相手;
Meaning
a person or thing competing with another for the same objective or for superiority in the same field
Example
The two companies have been business rivals for decades.
二つの企業は何十年もの間、商業上のライバルです。
A2 noun ˈrɛlətɪvz

Relatives

親戚
Meaning
A person connected by blood or marriage; a kinsman or kinswoman.
Example
Relatives can help you build a complete family tree.
親戚はあなたが完全な家系図を作る手助けをしてくれるかもしれません。
C1 adjective /raɪf/

rife

蔓延している
Meaning
widespread or common, often in a negative sense
Example
Corruption was rife in the old government system.
腐敗は古い政府制度に蔓延していた。
B1 noun rəʊlz

Roles

役割
Meaning
A person's or thing's function in a particular situation.
Example
Defined roles improve team performance.
定義された役割はチームのパフォーマンスを向上させる。
B1 adjective /rɪˈleɪ.tɪd/

Related

関連; 結びついている
Meaning
connected; associated; having a connection or relationship
Example
These two problems are closely related to each other.
これらの二つの問題はお互いに密接に関連しています。
C1 adjective /rɪˈpen.tənt/

Repentant

後悔している; 反省している; 悔いている
Meaning
feeling or expressing sincere regret and remorse; sorry for one's actions
Example
The repentant thief returned the stolen money.
後悔している泥棒は盗んだお金を返しました。
A1 verb /raɪd/

ride

乗る/ライディング
Meaning
to travel on or in a vehicle; to sit on and control a horse
Example
She likes to ride her bicycle to work.
彼女は自転車で仕事に行くのが好きです。
A2 verb /reɪz/

raise

上げる / 増加させる
Meaning
To lift or move something to a higher position; to increase; to bring up.
Example
She raised her hand to ask a question.
彼女は質問をするために手を上げました。
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。
B2 noun /roʊˈteɪʃən/

Rotation

回転; 回転運動; 自転
Meaning
the action of rotating around an axis or center; a single turn
Example
The Earth's rotation takes 24 hours to complete.
地球の回転は24時間かかります。
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 noun /ˈriːkɔːrs/

recourse

助け, 対処
Meaning
a source of help or protection in a difficult situation
Example
The students had no recourse but to appeal to the principal.
学生たちは校長に訴える以外に方法がなかった。
C1 noun /rɪˈflɛktər/

reflector

反射器
Meaning
A surface or device that reflects light, heat, or sound, often used to direct beams or improve visibility.
Example
The cyclist attached a red reflector to the back of his bike for safety.
自転車のライダーは安全のために自分の自転車の後ろに赤い反射器を取り付けました。
C1 verb /ˌrevəˈluːʃənaɪz/

revolutionize

革命的に変える
Meaning
Change (something) radically or fundamentally.
Example
Artificial intelligence is set to revolutionize the healthcare sector.
人工知能は医療分野を革命化する準備ができています。
C1 adjective /rɪˈflek.sɪv/

Reflexive

反射的; 内省的
Meaning
directed back on itself; showing deep thought about oneself
Example
She became more reflexive about her behavior after the feedback.
フィードバックの後、彼女は自分の行動についてもっと反省的になりました。
C2 adjective /ˈrɛɡnənt/

regnant

統治している
Meaning
Reigning; currently holding power, authority, or dominance.
Example
The regnant queen introduced several reforms during her reign.
統治している女王は、彼女の統治期間中にいくつかの改革を導入しました。
C1 verb /ˈrevəl/

revel

楽しむ
Meaning
to enjoy oneself in a lively and noisy way; to take great pleasure in
Example
They revel in their success.
彼らは成功を楽しんでいます。
C2 noun /ˈriːdʒənt/

regent

摂政
Meaning
a person who rules in place of a monarch when the monarch is absent or too young
Example
The prince acted as regent until the king came of age.
王子は王が成人するまで摂政として行動した。
B2 verb /ˌriːəˈreɪndʒ/

rearrange

再配置する
Meaning
to change the order or position of something
Example
She decided to rearrange the furniture in her living room.
彼女はリビングルームの家具を再配置することに決めました。
B1 adjective /ˈriː.zən.ə.bəl/

Reasonable

合理的; 公正で実用的; 高すぎない; 論理的
Meaning
fair and sensible; not too expensive; logical and practical
Example
The hotel offers reasonable prices for quality accommodation.
そのホテルは品質の高い宿泊施設に対して合理的な価格を提供しています。
C2 verb /raɪv/

rive

裂ける
Meaning
to tear apart violently
Example
The earthquake rived the ground in several places.
地震がいくつかの場所で地面を裂けました。
C1 noun /rɪˌtæl.iˈeɪ.ʃən/

Retaliation

報復
Meaning
the action of returning a military attack; counterattack; revenge for an injury or wrong
Example
The country threatened retaliation against any act of aggression.
その国はあらゆる攻撃行為に対して報復を予告しました。
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。
C1 noun /rɛnˈdɪʃən/

rendition

演奏
Meaning
a performance or interpretation of a piece of art, music, or text
Example
The singer gave a moving rendition of the classic song.
歌手はクラシックな歌の感動的な演奏を行いました。
B1 noun /ruːˈtiːn/

routine

ルーチン, 習慣, 固定された順序
Meaning
A sequence of actions regularly followed; a fixed program.
Example
A well-structured routine improves productivity.
よく構造化されたルーチンは生産性を向上させます。
B2 verb /rɪˈvɜːrt/

revert

戻る
Meaning
to return to a previous state, condition, or practice
Example
The system will revert to its original settings after the update.
システムは更新後、元の設定に戻ります。
C2 noun /rɪˈfrɪndʒənsi/

refringency

屈折率
Meaning
The ability of a substance to bend light; refractive power.
Example
Glass has a higher refringency than water.
ガラスは水よりも高いリフリンジェンシーを持っています。
B2 verb /ˈræm.bəl/

ramble

Meaning
to talk or write at length in a confused or inconsequential way; to walk for pleasure without a fixed route.
Example
He rambled on about his childhood for hours.
C1 adjective rɪˈlɛntləs

relentless

容赦ない
Meaning
Oppressively constant; incessant; showing no abatement of severity, intensity, strength, or pace.
Example
The freedom fighters' relentless struggle led to victory.
自由戦士たちの容赦ない戦いは勝利へと導いた。
B2 verb /rɪˈsaɪt/

recite

暗唱する
Meaning
To say aloud something learned, especially poetry or text, from memory.
Example
The child recited a poem in front of the class.
その子はクラスの前で詩を暗唱しました。
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。
C2 adjective /rɪˈmɪs/

remiss

怠慢
Meaning
Negligent in performing a duty or responsibility.
Example
The manager was remiss in not checking the financial reports carefully.
マネージャーは財務報告書を慎重に確認しなかったことで怠慢だった。
C1 adjective /rɪˈtɜː.nə.bəl/

Returnable

返品可能
Meaning
able to be returned or given back
Example
The bottle is returnable for a deposit refund.
ボトルはデポジット返金のために返品可能です。
B1 adjective /rɪˈmɑːrkəbl/

Remarkable

注目すべき; 非凡な; 顕著な;
Meaning
worthy of attention; extraordinary; notable;
Example
His recovery from the illness was remarkable.
病気から回復することは注目すべきことでした。
B2 noun /ˌrep.ɪˈtɪʃ.ən/

Repetition

繰り返し
Meaning
the action of repeating something that has already been said or written
Example
Constant repetition helps students memorize vocabulary effectively.
継続的な繰り返しは、学生が語彙を効果的に覚えるのを助けます。
B2 noun ˌrev.əˈluː.ʃənz

revolutions

革命
Meaning
Dramatic and wide-reaching changes in political, social, or economic systems, often involving the overthrow of a government or social order.
Example
Revolutions often lead to significant societal changes.
革命はしばしば社会的な変革をもたらす。
B2 noun /rɒd/

rod

金属または木材の細長い棒
Meaning
a thin straight bar, especially of metal or wood
Example
He used an iron rod to support the structure.
彼は構造を支えるために鉄のロッドを使いました。
C1 noun ˌriːˌvaɪ.təl.aɪˈzeɪ.ʃən

revitalization

再生
Meaning
The action of giving new life and vitality to something.
Example
Proper rest and nutrition lead to revitalization of the body.
適切な休息と栄養は体のリバイタライゼーションに繋がります。
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 noun /ˈrem.ə.di/

Remedy

薬; 治療; 問題解決の手段
Meaning
a medicine or treatment for a disease; a solution to a problem
Example
This herbal remedy helps with headaches.
このハーブの薬は頭痛に効く。
B1 noun /rɪˈliːf/

Relief

安心; 安堵; 支援
Meaning
a feeling of comfort after worry or distress; assistance given to those in need
Example
She felt great relief when the exam was over.
試験が終わったとき、彼女は大きな安堵感を感じました。
C2 noun /ræpˈskæliən/

rapscallion

いたずら好きな人
Meaning
A mischievous or cheeky person; a rascal.
Example
The little rapscallion hid his brother’s shoes as a prank.
小さなラプスカリオンは兄の靴をいたずらで隠した。
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。
B1 noun /rɪˈspɒns/

Response

反応; 応答
Meaning
a reaction to something; an answer or reply; the way in which something reacts to external stimulus
Example
The government's response to the crisis was swift and decisive.
政府の危機への反応は迅速で決定的でした。
C1 adjective /rɪˈpjuː.t̬ɪd/

Reputed

評判の良い; 有名な
Meaning
generally said or believed to be; having a particular reputation
Example
He is reputed to be one of the best doctors in the country.
彼はその国で最高の医者の一人と見なされています。
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。
A2 noun /ruːf/

roof

屋根
Meaning
the top covering of a building or vehicle
Example
The roof of the house needs to be repaired.
家の屋根は修理が必要です。
C1 verb /ˌriːəˈfɜːrm/

reaffirm

再確認する
Meaning
To state again strongly; to confirm or strengthen a statement or belief.
Example
The president reaffirmed his commitment to education reform.
大統領は教育改革への取り組みを再確認した。