demographic transition
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C1 noun ˌdɛməˈɡræfɪk trænˈzɪʃən

demographic transition

人口転換
Meaning
A shift in population patterns from high birth and death rates to low birth and death rates as a country develops economically
Example
The demographic transition indicates a shift towards an aging society.
人口転換は高齢化社会への移行を示しています。
C1 verb /dɪˈfeɪm/

defame

名誉毀損
Meaning
to harm someone's reputation by spreading false information
Example
He was defamed by malicious rumors.
彼は悪意のある噂で中傷されました。
C1 adjective /dɪˈɡreɪdɪd/

degraded

劣化した
Meaning
Reduced in quality, dignity, or condition.
Example
The villagers were forced to live in degraded conditions.
村人たちは劣化した状態で暮らさざるを得なかった。
C1 adjective /dɪˈspɜːrst/

dispersed

散らばった
Meaning
Scattered or spread across a wide area.
Example
The dispersed population made it difficult to provide public services.
散らばった人口は公共サービスの提供を困難にしました。
C1 noun /djuːˈɛt/

duet

デュエット
Meaning
a musical performance by two singers or instrumentalists
Example
They sang a beautiful duet together on stage.
彼らはステージで一緒に美しいデュエットを歌った。
C1 verb /ˈdɛsɪmeɪt/

decimate

壊滅させる
Meaning
To destroy or kill a large proportion of something.
Example
The wildfire decimated the forest.
森林火災が森を壊滅させました。
C1 verb /dɪˈspɜːrs/

disperse

解散する
Meaning
To scatter or spread widely in different directions.
Example
The police used tear gas to disperse the crowd.
警察は群衆を解散させるために催涙ガスを使用しました。
C1 verb /diːˈkoʊd/

decode

Meaning
to convert a coded message into a readable form; to interpret meaning
Example
The software can decode the hidden message within seconds.
C1 noun /ˈdɒktrɪn/

doctrine

教義
Meaning
A set of beliefs or principles held and taught by a religious, political, or other group.
Example
The church follows a strict doctrine on moral values.
教会は道徳的価値に関する厳格な教義を遵守しています。
C1 noun /ˈdaʊn.pɔːr/

Downpour

豪雨; 急な大雨
Meaning
a heavy fall of rain; a sudden heavy rainfall
Example
The sudden downpour caught everyone off guard and soaked the outdoor event.
突然の豪雨でみんなが驚き、屋外イベントはずぶ濡れになった。
C1 verb /dɪsˈɡrʌntl/

disgruntle

不満にさせる
Meaning
to make someone dissatisfied or discontented
Example
The unfair treatment disgruntled the workers.
不公平な扱いが労働者を不満にさせた。
C1 adjective /ˈdeɪnti/

dainty

優雅で可愛らしい
Meaning
Delicately small, pretty, and often considered elegant.
Example
She wore a dainty necklace made of pearls.
彼女は真珠でできた繊細なネックレスをしていました。
C1 adjective /dɪˈskriːt/

discrete

離散的
Meaning
individually separate and distinct
Example
The course is divided into three discrete modules.
コースは3つの離散的なモジュールに分けられています。
C1 noun /ˈdɛməɡɒɡ/

demagogue

デマゴーグ
Meaning
A political leader who seeks support by appealing to popular desires and prejudices rather than by using rational argument.
Example
The crowd was swayed by the fiery speeches of the demagogue.
群衆はデマゴーグの情熱的な演説に影響された。
C1 noun /ˈdæɡ.ər/

Dagger

短剣
Meaning
a short knife with a pointed blade used as a weapon
Example
The ancient warrior carried a silver dagger.
古代の戦士は銀の短剣を携えていた。
C1 noun /ˈdæn.drʌf/

Dandruff

フケ
Meaning
small white or grey flakes of dead skin that form on the scalp and fall from the hair
Example
He used a special shampoo to treat his persistent dandruff problem.
彼は慢性的なフケの問題を治すために、特別なシャンプーを使った。
C1 noun /ˌdiːˈmer.ɪt/

Demerit

欠点; 不利; 過ちや違反に対して与えられるマーク
Meaning
a fault or disadvantage; a mark given for a fault or offense
Example
The student received a demerit for arriving late to class repeatedly.
その生徒は繰り返し遅刻したため、デメリットを受けました。
C1 verb /dɪsˈpærɪdʒ/

disparage

Meaning
to criticize someone or something in a way that shows a lack of respect
Example
It is unfair to disparage people for their opinions.
C1 noun /draɪ ˈtʃɪl.i/

Dry Chilli

乾燥唐辛子
Meaning
dried chili peppers used as spice for adding heat to food
Example
The recipe calls for two dry chillies to make it spicy.
レシピにはそれを辛くするために2つの乾燥唐辛子が必要です。
C1 adjective draʊt rɪˈzɪs.tənt

drought-resistant

耐乾燥
Meaning
Able to survive and grow despite limited water availability or drought conditions.
Example
Drought-resistant crops can survive in arid conditions.
耐乾燥作物は乾燥した条件でも生き残ることができます。
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 noun/verb /dɛnt/

dent

へこみ
Meaning
a small hollow mark on the surface of something; to make a small hollow mark
Example
The accident left a dent in the car door.
事故で車のドアにへこみが残りました。
C1 adjective /ˈdɪzməl/

Dismal

陰気な; 落ち込んだ; 悲しい
Meaning
gloomy; depressing; causing sadness or despair
Example
The weather was dismal with heavy rain and dark clouds.
天気は雨と暗い雲で陰気でした。
C1 noun/adjective /dɪˈtɜː.rənt/

deterrent

抑止力
Meaning
A thing that discourages or is intended to discourage someone from doing something.
Example
A strict law serves as a deterrent to crime.
厳格な法律は犯罪の抑止力として機能します。
C1 verb /dɪsˈlɒdʒ/

dislodge

追い出す
Meaning
To remove or force out from a position, especially one that is fixed or hard to move.
Example
The troops dislodged the enemy from the hill.
部隊は敵を丘から追い出した。
C1 verb /ˌdɪsɪmˈbɑːrk/

disembark

降りる
Meaning
To leave a ship, aircraft, or other vehicle.
Example
The passengers disembarked from the plane after landing.
乗客は着陸後、飛行機から降りました。
C1 verb /deɪz/

daze

Meaning
to stun or confuse someone temporarily with a shock or surprise
Example
The bright lights dazed the runners as they entered the stadium.
C1 noun /ˈdɑːrwɪnɪzəm/

darwinism

ダーウィニズム
Meaning
the theory of biological evolution developed by Charles Darwin, emphasizing natural selection
Example
Darwinism revolutionized the way scientists understood the origin of species.
ダーウィニズムは科学者たちが種の起源を理解する方法を革命的に変えました。
C1 noun dɪˌzɝː.t̬ə.fɪˈkeɪ.ʃən

desertification

砂漠化
Meaning
The process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
Example
Deforestation accelerates desertification.
森林伐採は砂漠化を加速させます。
C1 verb /doʊt/

dote

溺愛する
Meaning
to show excessive love or fondness for someone or something
Example
She tends to dote on her grandchildren.
彼女は孫たちに溺愛する傾向があります。
C1 verb /dɪˈsɛm.ɪ.neɪt/

disseminate

普及する
Meaning
To spread or give out something, especially news, information, ideas, etc., to a lot of people.
Example
Social media helps to disseminate information quickly.
ソーシャルメディアは情報を迅速に普及するのに役立ちます。
C1 noun /ˈdrɪz.əl/

Drizzle

小雨
Meaning
light rain falling in very fine drops; a very light rainfall
Example
The gentle drizzle continued throughout the morning, making everything misty.
穏やかな小雨は朝の間中続き、すべてが霧のようになりました。
C1 noun /dɪˈlɪriəm/

delirium

錯乱
Meaning
An acutely disturbed state of mind characterized by restlessness, illusions, and incoherence.
Example
The patient experienced delirium after the surgery due to the strong medication.
患者は手術後、強い薬物の影響で錯乱状態を経験しました。
C1 adjective /dɪˈplɔːrəbl/

deplorable

ひどい
Meaning
deserving strong condemnation; shockingly bad in quality
Example
The refugees were living in deplorable conditions.
難民はひどい状況で生活していた。
C1 verb /ˈdɪsləkeɪt/

dislocate

脱臼する
Meaning
To disturb the normal position of something, especially a joint in the body.
Example
He dislocated his shoulder while playing football.
彼はサッカーをしているときに肩を脱臼しました。
C1 adjective /drəˈkoʊniən/

draconian

ドラコニアン
Meaning
Extremely harsh and severe, especially laws or rules.
Example
The new regulations were criticized as draconian.
新しい規制はドラコニアンだと批判されました。
C1 noun /draɪ fɪʃ/

Dry fish

干物
Meaning
fish that has been preserved by drying in the sun or by other dehydration methods
Example
Dry fish is a popular preserved food in many coastal regions.
干物は多くの沿岸地域で人気のある保存食です。
C1 noun ˌdaɪvɜːsɪfɪˈkeɪʃən

diversification

多様化
Meaning
The practice of spreading investments across various assets or sectors to reduce risk.
Example
Diversification helps to reduce investment risk.
ダイバーシフィケーションは投資リスクを減らすのに役立ちます。
C1 noun /ˌdev.əˈtiː/

Devotee

信者; 献身者
Meaning
a person who is very interested in and enthusiastic about someone or something
Example
As a devotee of classical music, she attended every concert in the city.
クラシック音楽の信者として、彼女は都市のすべてのコンサートに参加していました。
C1 adjective /ˌdɪktəˈtɔːriəl/

dictatorial

独裁的
Meaning
Having or showing a tendency to tell people what to do in an autocratic way.
Example
His dictatorial style made him unpopular among colleagues.
彼の独裁的なスタイルは、同僚たちの間で不人気だった。
C1 noun dɪˈsʌɪsɪvnɪs

decisiveness

決断力
Meaning
The ability to make decisions quickly and effectively.
Example
His decisiveness during the crisis saved the company.
危機の際、彼の決断力が会社を救った。
C1 verb /dɪsˈkwɑːlɪfaɪ/

disqualify

失格する
Meaning
to officially prevent someone from participating or being eligible
Example
The referee decided to disqualify the player for cheating.
審判は不正行為のために選手を失格にすることを決定しました。
C1 verb /ˈdiːmɑːrˌkeɪt/

demarcate

境界を定める
Meaning
to set the boundaries or limits of something
Example
The land was demarcated with fences to avoid disputes.
土地はフェンスで境界が定められて、争いを避けました。
C1 adjective /ˌdɪfəˈrɛnʃəl/

differential

差別的
Meaning
Relating to or showing a difference; involving a distinction.
Example
There is a differential treatment between the two groups.
2つのグループ間に差別的な扱いがあります。
C1 verb /dɪˈsɛkt/

dissect

Meaning
to cut apart an animal, plant, or other organism to study its internal parts; to analyze something in detail
Example
In biology class, students had to dissect a frog to learn about its anatomy.
C1 verb /dɪsˈkʌlər/

discolor

色あせる
Meaning
to change color, especially in a way that spoils the original appearance
Example
The fabric began to discolor after being left in the sun.
生地は太陽の下に置かれてから色が変わり始めました。
C1 verb /ˈdɪs.ɪ.peɪt/

dissipate

徐々に消失する
Meaning
To disappear or cause to disappear gradually.
Example
The tension in the room slowly dissipated.
部屋の中の緊張感は徐々に消えていった。
C1 adjective dɪˈskrɪmɪnətɔːri

discriminatory

差別的
Meaning
Making or showing an unfair or prejudicial distinction between different categories of people or things.
Example
Discriminatory policies triggered protests.
差別的な政策は抗議を引き起こしました。
C1 noun /ˈdaɪnəˌmoʊ/

dynamo

電気を発生させる機械; 大きなエネルギーと熱意を持つ人物
Meaning
A machine that generates electricity; a person with great energy and enthusiasm.
Example
She is the real dynamo behind the success of the company.
彼女は会社の成功の背後にある本物のダイナモです。
C1 noun /ˌdɪsəˈluːʃən/

dissolution

解散
Meaning
the act of formally ending or breaking apart something, such as an organization or marriage
Example
The dissolution of the company was announced yesterday.
会社の解散は昨日発表されました。
C1 verb /diːˈfɒrɪst/

deforest

Meaning
to clear an area of trees, usually on a large scale
Example
The region has been heavily deforested for agriculture.
C1 adverb /ˈduːli/

Duly

適切に, 時間通りに
Meaning
in accordance with what is required or appropriate; at the proper time
Example
The documents were duly signed and submitted.
書類は適切に署名され、提出されました。
C1 verb /dɪsˈmæntəl/

dismantle

解体する
Meaning
to take apart; to remove or destroy the parts of
Example
Workers will dismantle the old bridge next month.
作業員たちは来月古い橋を解体します。
C1 verb /dɪˈbeɪs/

debase

低下させる
Meaning
to reduce the quality, value, or dignity of something
Example
Corruption can debase the values of a society.
腐敗は社会の価値観を低下させる可能性があります。
C1 adjective /ˈdestatəʊt/

Destitute

困窮した; 貧しい; 財産もお金もない
Meaning
extremely poor; without money or possessions
Example
Many families became destitute after the economic collapse.
経済崩壊後、多くの家族は困窮しました。
C1 noun /diːˈkrɪp.ʃən/

decryption

復号
Meaning
The process of converting encrypted data back into its original form so it can be understood.
Example
Hackers attempted decryption of classified data.
ハッカーは分類されたデータの復号を試みました。
C1 verb /drɛntʃ/

drench

びしょ濡れにする
Meaning
to make someone or something completely wet
Example
The sudden rain drenched the players on the field.
突然の雨がフィールドの選手たちをびしょ濡れにした。
C1 adjective /ˈdaʊ.ər/

dour

厳格
Meaning
relentlessly severe, stern, or gloomy in manner or appearance
Example
His dour expression made the meeting uncomfortable.
彼の厳格な表情は会議を不快にした。
C1 noun /dɪˈten.ʃən/

Detention

停学; 拘留
Meaning
the action of detaining someone or being detained in official custody
Example
The student received detention for repeatedly disrupting the class.
生徒は繰り返しクラスを乱したため、停学を受けました。
C1 adjective /ˈdɒdʒi/

Dodgy

疑わしい; 質が悪い; 信頼できない; 危険なまたはリスクのある
Meaning
suspicious; questionable; unreliable; risky or dangerous
Example
That deal sounds dodgy to me.
その取引は私には疑わしく聞こえます。
C1 noun /dɪˈrɪʒən/

derision

嘲笑
Meaning
Contemptuous ridicule or mockery.
Example
His ideas were greeted with derision by the audience.
彼のアイデアは観客によって嘲笑された。
C1 adjective /ˈdaʊn.kæst/

downcast

Meaning
feeling sad, dejected, or with lowered eyes
Example
He looked downcast after hearing the bad news.
C1 adjective /dɪˈmɛntɪd/

demented

狂った / 非理性的
Meaning
behaving irrationally due to mental illness or extreme excitement
Example
He looked demented after hearing the shocking news.
彼は衝撃的なニュースを聞いた後、正気を失ったように見えました。
C1 adjective /dɪˈspɒndənt/

despondent

Meaning
feeling or showing deep hopelessness or discouragement
Example
She felt despondent after losing her job.
C1 verb /dɪˈstɪl/

distill

Meaning
To purify a liquid by heating and cooling; to extract the essential meaning or most important aspects.
Example
The factory distills water to make it safe for drinking.
C1 verb /dɪˈfrɔːd/

defraud

詐欺
Meaning
to illegally take money or valuables from someone by deception
Example
The company was accused of trying to defraud investors.
その会社は投資家をだまそうとしたとして告発されました。
C1 adjective /ˈdjuːtɪfəl/

Dutiful

義務感のある; 尊敬すべき; 従順な
Meaning
conscientiously fulfilling one's duty; obedient; respectful
Example
She is a dutiful daughter who always helps her parents.
彼女はいつも両親を助ける義務感のある娘です。
C1 noun /dɪˌpriː.ʃiˈeɪ.ʃən/

depreciation

減価償却
Meaning
A reduction in the value of an asset with the passage of time, due to wear and tear.
Example
The car's depreciation rate is high after five years.
車の減価償却率は5年後に高くなります。
C1 noun /ˈdaʊri/

dowry

持参金
Meaning
Property or money brought by a bride to her husband at marriage.
Example
The dowry tradition is still followed in some cultures.
いくつかの文化では、持参金の伝統が今でも守られています。
C1 adjective /dɪˈfɛnsəbəl/

defensible

守ることができる / 正当化できる
Meaning
Capable of being protected against attack or criticism; justifiable.
Example
Her decision was legally defensible.
彼女の決定は法的に守ることができた。
C1 noun /ˈdjuːplɛks/

duplex

デュプレックスハウス
Meaning
A house or apartment divided into two separate residences.
Example
They live in a duplex near the city center.
彼らは市の中心近くのデュプレックスに住んでいます。
C1 noun ˈdaɪ.nə.sti

dynasty

王朝
Meaning
A line of hereditary rulers of a country; a succession of people from the same family who play a prominent role in business, politics, or another field.
Example
The Ming dynasty ruled China for centuries.
明王朝は何世紀にもわたって中国を支配していました。
C1 noun /dɪˈmiːnər/

demeanor

態度
Meaning
a person's outward behavior or appearance
Example
Her calm demeanor impressed everyone at the meeting.
彼女の冷静な態度は会議で皆に感銘を与えました。
C1 noun dɪˈtɜː.mɪ.nənt

determinant

決定的な要素
Meaning
A factor that decisively affects the nature or outcome of something.
Example
Education is a key determinant of success.
教育は成功の重要な決定的要素です。
C1 adjective /dɪˈsperɪŋ/

Despairing

絶望的な
Meaning
feeling hopeless; in despair
Example
She felt despairing after losing her job.
彼女は仕事を失った後、絶望的な気持ちだった。
C1 verb /daɪˈvɛst/

divest

Meaning
to strip away possessions, rights, or assets; to rid oneself of
Example
The company decided to divest its unprofitable division.
C1 noun /ˈdeɪ.li.ə/

Dahlia

ダリア
Meaning
a garden plant with brightly colored flowers that bloom in summer and autumn
Example
She planted colorful dahlias in her garden last summer.
彼女は昨年の夏に庭にカラフルなダリアを植えました。
C1 noun /dɪsˈsɜːrvɪs/

disservice

害
Meaning
A harmful action; something that does damage rather than help.
Example
Spreading false information is a disservice to the community.
偽の情報を広めることは、コミュニティに害を与えることです。
C1 noun /ˌdɪp.ləˈmæt.ɪk ˈmaɪl.stəʊn/

diplomatic milestone

外交上のマイルストーン
Meaning
A significant achievement or important event in diplomatic relations.
Example
Hosting the summit was a diplomatic milestone.
サミットの開催は外交上のマイルストーンでした。
C1 verb /ˌdɪskənˈsɜːrt/

disconcert

動揺させる
Meaning
To unsettle, confuse, or disturb the composure of someone.
Example
The sudden change of plans disconcerted the team.
突然の計画変更がチームを混乱させた。
C1 noun /dɪˈkɔː.rəm/

Decorum

礼儀; 品位; 威厳
Meaning
behavior in keeping with good taste and propriety; dignified and appropriate conduct
Example
The diplomat maintained perfect decorum throughout the heated negotiations.
その外交官は熱心な交渉の中で完璧な礼儀を保っていました。
C1 verb /dɪˈsweɪd/

dissuade

思いとどまらせる
Meaning
To persuade someone not to do something.
Example
She tried to dissuade him from quitting his job.
彼女は彼に仕事を辞めさせないように説得しようとした。
C1 noun ˌdiːˌrɛɡ.jʊˈleɪ.ʃən

deregulation

規制緩和
Meaning
The removal or reduction of government regulations in an economic sector.
Example
Deregulation has increased competition in the telecommunications sector.
規制緩和は通信業界で競争を促進しました。
C1 noun /ˌdɪstɪˈleɪʃən/

distillation

蒸留
Meaning
The process of purifying a liquid by heating and cooling; the extraction of the essential meaning.
Example
Distillation is commonly used to produce alcoholic beverages.
蒸留はアルコール飲料の製造によく使用されます。
C1 adjective deft

deft

器用
Meaning
Neatly skillful and quick in one's movements; dexterous and adroit.
Example
The artist's deft hands created a masterpiece.
アーティストの器用な手は傑作を作り出しました。
C1 noun ˈdɛf.ər.əns

deference

敬意
Meaning
Humble submission and respect.
Example
He showed deference to his elderly mentor.
彼は年上のメンターに敬意を示しました。
C1 noun /dɪˈluːʒən/

delusion

錯覚
Meaning
A false belief or impression maintained despite being contradicted by reality.
Example
He lived under the delusion that he was invincible.
彼は自分が無敵だという錯覚の中で生きていた。
C1 adjective ˈdɔːn.tɪŋ

daunting

威圧的または挑戦的な
Meaning
Something that seems intimidating or challenging.
Example
The task seemed daunting, but she completed it successfully.
その仕事は威圧的に見えたが、彼女はそれを成功裏に終わらせた。
C1 noun, adjective /dɪˈfiːtɪst/

defeatist

敗北主義者
Meaning
A person who expects or is excessively ready to accept failure; showing a tendency to expect defeat.
Example
His defeatist attitude discouraged the rest of the team.
彼の敗北主義的な態度は、チームの他のメンバーを落胆させました。
C1 verb /dɪsˈfɪɡjər/

disfigure

変形させる
Meaning
to spoil or damage the appearance of something
Example
The fire disfigured the old building.
火事は古い建物を変形させた。
C1 noun /ˈdeɪ.ə.ti/

deity

神
Meaning
a god or goddess
Example
The temple is dedicated to a Hindu deity.
その寺院はヒンドゥー教の神に捧げられています。
C1 verb dɪˈlɪnieɪt

delineate

詳細に描写する
Meaning
To describe or portray something precisely
Example
The artist delineated the scene in intricate detail.
アーティストはシーンを複雑な詳細で描写しました。
C1 adjective /dɪˈfaɪənt/

Defiant

反抗的な; 逆らう
Meaning
boldly resistant or challenging; disobedient
Example
The defiant student refused to follow the rules.
その反抗的な学生はルールに従うことを拒否しました。
C1 noun /ˌdɪsbɪˈliːvər/

disbeliever

不信者
Meaning
a person who does not believe in something, especially a religion or idea
Example
He was called a disbeliever for rejecting the traditional faith.
彼は伝統的な信仰を拒否したため、不信者と呼ばれました。
C1 noun /dɪˈfɛkʃən/

defection

脱党
Meaning
The act of abandoning one’s country, cause, or group in favor of another.
Example
The politician’s defection shocked his supporters.
その政治家の脱党は支持者を驚かせました。
C1 verb /daɪˈɡrɛs/

digress

Meaning
To leave the main subject temporarily in speech or writing.
Example
The professor began to digress from the main topic of the lecture.
C1 noun /ˌdɪsəˈbiːdiəns/

disobedience

不従順
Meaning
failure or refusal to obey rules, laws, or authority
Example
The child's disobedience worried his parents.
子供の不従順は両親を心配させました。
C1 noun ˌdiː.sen.trə.laɪˈzeɪ.ʃən

decentralization

分権
Meaning
The transfer of authority from central to local government.
Example
Decentralization promotes regional autonomy.
分権は地域の自立を促進します。
C1 verb /ˌdiː.kəmˈprɛs/

decompress

リラックスする
Meaning
To relax and recover from stress or pressure.
Example
Taking deep breaths helps to decompress after a stressful day.
深呼吸は、ストレスの多い一日後にリラックスするのに役立ちます。
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 /ˈdæmpər/

damper

力、効果、または興奮を減少または抑制するもの
Meaning
something that reduces or lessens the force, effect, or excitement
Example
The cancellation of the trip put a damper on their enthusiasm.
旅行のキャンセルは彼らの熱意をそぐことになった。
C1 noun /ˈdɛljuːdʒ/

deluge

洪水
Meaning
A severe flood; an overwhelming quantity of something.
Example
The town was hit by a deluge of rain in just a few hours.
その町は数時間で豪雨の洪水に襲われました。
C1 adjective dɪ ˈskrɛʃ.ən.er.i

discretionary

裁量の
Meaning
Available for use at the discretion of the user; not required or mandatory.
Example
He set aside some discretionary income for travel.
彼は旅行のためにいくらかの裁量所得を取っておいた。
C1 noun dɪˌlɪb.əˈreɪ.ʃən

deliberation

熟考
Meaning
Long and careful consideration or discussion.
Example
The agreement was finalized after much deliberation.
その合意は多くの熟考の末に最終決定されました。
C1 adjective /ˈdrɪəri/

dreary

陰気な / 退屈な
Meaning
dull, bleak, and lifeless; depressing
Example
The long, dreary winter made everyone feel gloomy.
長くて退屈な冬は、皆を憂鬱にさせた。
C1 adjective /dɪˈsɜːrnəbl/

discernible

明白な
Meaning
able to be seen, recognized, or understood
Example
There was a discernible change in his behavior.
彼の行動には明らかな変化があった。
C1 noun /daɪˈvɜː.dʒəns/

divergence

分岐
Meaning
The process or state of diverging; a difference or deviation between two or more things.
Example
The divergence in their opinions led to a heated debate.
彼らの意見の相違は激しい議論を引き起こしました。
C1 noun /ˈdɑː.mə.saɪl/

domicile

住居地
Meaning
A person's legal residence or permanent home.
Example
He declared Canada as his legal domicile.
彼はカナダを彼の法的な住居地として宣言しました。
C1 verb /ˈdaʊn.pleɪ/

downplay

軽視する
Meaning
to make something seem less important than it really is
Example
The company tried to downplay the risks of the new product.
会社は新しい製品のリスクを軽視しようとしました。
C1 noun /ˌdɛməˈlɪʃən/

demolition

解体
Meaning
the act or process of destroying a building or structure
Example
The demolition of the old factory took several weeks.
古い工場の解体には数週間かかりました。
C1 noun /ˌdep.rɪˈveɪ.ʃən/

deprivation

剥奪, 欠乏, 不足
Meaning
The damaging lack of material benefits considered to be basic necessities in a society.
Example
Sleep deprivation affects cognitive function.
睡眠不足は認知機能に影響を与えます。
C1 adjective /ˈdraʊ.zi/

Drowsy

眠い; 疲れた; 無気力な
Meaning
feeling sleepy and lethargic; half asleep; tired
Example
I felt drowsy after the heavy meal.
重い食事の後、眠気を感じました。
C1 verb /dɪˈtrækt/

detract

Meaning
To reduce or take away the worth or value of something.
Example
His rude behavior will detract from his good reputation.
C1 verb /ˈdræm.ə.taɪz/

dramatize

ドラマ化する
Meaning
to present a story in a dramatic way, or to exaggerate something
Example
The novel was dramatized into a popular TV series.
その小説は人気のテレビシリーズにドラマタイズされました。
C1 noun /ˌdɛrɪˈveɪʃən/

derivation

派生
Meaning
The origin or development of something from a source.
Example
The derivation of the word comes from Latin.
その単語の起源はラテン語から来ている。
C1 noun/verb /ˈdiːkɔɪ/

decoy

おとり
Meaning
something or someone used to lure or mislead
Example
The hunters used a wooden duck as a decoy.
狩人たちは木製のカモをデコイとして使った。
C1 noun /ˌdɒmɪˈneɪʃən/

domination

支配
Meaning
the exercise of control or influence over someone or something
Example
The empire sought domination over its neighbors.
帝国は隣国に対する支配を求めていた。
C1 noun /ˈdɪs.ə.nəns/

dissonance

不協和音
Meaning
Disagreement, lack of harmony, conflict between ideas or beliefs.
Example
The cultural dissonance created misunderstandings.
文化的な不協和音が誤解を生んだ。
C1 adjective /dɪˈpreɪvd/

depraved

堕落した
Meaning
morally corrupt or wicked
Example
The film depicts the life of a depraved criminal.
その映画は堕落した犯罪者の人生を描いています。
C1 verb /dɪˈteɪn/

detain

Meaning
to keep someone from proceeding; to hold back, especially by official authority
Example
The police detained the suspect for questioning.
C1 noun dɪˌtɪə.ri.əˈreɪ.ʃən

deterioration

劣化
Meaning
The process of becoming progressively worse; decline in quality, condition, or strength.
Example
Poor maintenance leads to material deterioration.
不十分なメンテナンスは材料の劣化を引き起こす。