defection
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C1 noun /dɪˈfɛkʃən/

defection

Meaning
The act of abandoning one’s country, cause, or group in favor of another.
Example
The politician’s defection shocked his supporters.
C1 adjective /dɪˈfaɪənt/

Defiant

Meaning
boldly resistant or challenging; disobedient
Example
The defiant student refused to follow the rules.
C1 adjective /dɪsˈhɑːrtənd/

Disheartened

Meaning
discouraged; feeling dejected; losing hope or confidence
Example
She felt disheartened after failing the exam twice.
C1 verb /ˈdaʊn.pleɪ/

downplay

Meaning
to make something seem less important than it really is
Example
The company tried to downplay the risks of the new product.
C1 noun /dɪˈsaɪ.pəl/

Disciple

Meaning
a follower and student of a teacher, leader, or philosopher; devoted follower
Example
The famous philosopher had many disciples who spread his teachings worldwide.
C1 noun /ˈdeɪ.li.ə/

Dahlia

Meaning
a garden plant with brightly colored flowers that bloom in summer and autumn
Example
She planted colorful dahlias in her garden last summer.
C1 verb /dɪˈraɪd/

deride

Meaning
to mock or ridicule someone or something
Example
The critics derided the new movie for its poor script.
C1 noun ˌdiːˌrɛɡ.jʊˈleɪ.ʃən

deregulation

Meaning
The removal or reduction of government regulations in an economic sector.
Example
Deregulation has increased competition in the telecommunications sector.
C1 noun /dɪˈkriː/

Decree

Meaning
an official order issued by a legal authority; a judicial decision or edict
Example
The king issued a decree that all citizens must pay additional taxes.
C1 noun /dɪˈfɪʃ.ən.si/

Deficiency

Meaning
a lack or shortage of something; inadequacy or insufficiency
Example
The doctor diagnosed a vitamin D deficiency in the patient's blood test.
C1 noun /dɪsˈɪntrəst/

disinterest

Meaning
lack of interest or concern
Example
His disinterest in the project was obvious.
C1 adjective /dɪˈsɪd.ju.əs/

deciduous

Meaning
Referring to trees that shed their leaves seasonally, typically in autumn.
Example
Oak and maple trees are deciduous, shedding leaves in autumn.
C1 adjective /ˈdraʊ.zi/

Drowsy

Meaning
feeling sleepy and lethargic; half asleep; tired
Example
I felt drowsy after the heavy meal.
C1 noun /ˌdɛfəˈmeɪʃən/

defamation

Meaning
the act of damaging someone's reputation by making false statements
Example
The newspaper was sued for defamation of character.
C1 verb /ˌdɪsəˈsɛmbəl/

disassemble

Meaning
To take apart something into its separate pieces.
Example
He had to disassemble the computer to repair it.
C1 verb /dɪˈluːd/

delude

Meaning
To mislead someone into believing something that is not true.
Example
He deluded himself into thinking he could win the race without training.
C1 noun /ˈdɔːrˌkiːpər/

doorkeeper

Meaning
A person whose job is to guard or manage the entrance of a building or room.
Example
The doorkeeper checked everyone’s passes before they entered the hall.
C1 adjective /ˈdaʊn.kæst/

downcast

Meaning
feeling sad, dejected, or with lowered eyes
Example
He looked downcast after hearing the bad news.
C1 noun ˌdjʊə.rəˈbɪl.ə.ti

durability

Meaning
The ability to withstand wear, pressure, or damage; hard-wearing.
Example
The durability of materials affects performance.
C1 adjective /dɪˈmɛntɪd/

demented

Meaning
behaving irrationally due to mental illness or extreme excitement
Example
He looked demented after hearing the shocking news.
C1 adjective /ˈdek.stər.əs/

dexterous

Meaning
Showing or having skill, especially with the hands; mentally adroit and skillful.
Example
A dexterous programmer can write complex codes effortlessly.
C1 noun /ˌdɪsbɪˈliːvər/

disbeliever

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.
C1 noun /ˈduːmz.deɪ/

Doomsday

Meaning
the last day of the world's existence; a time of catastrophic destruction
Example
The preacher spoke about doomsday and the importance of preparing spiritually.
C1 noun dɪˌtɪə.ri.əˈreɪ.ʃən

deterioration

Meaning
The process of becoming progressively worse; decline in quality, condition, or strength.
Example
Poor maintenance leads to material deterioration.
C1 noun /ˈdæn.drʌf/

Dandruff

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.
C1 noun /ˈdɑːrwɪnɪzəm/

darwinism

Meaning
the theory of biological evolution developed by Charles Darwin, emphasizing natural selection
Example
Darwinism revolutionized the way scientists understood the origin of species.
C1 verb /ˌdɪsɪmˈbɑːrk/

disembark

Meaning
To leave a ship, aircraft, or other vehicle.
Example
The passengers disembarked from the plane after landing.
C1 adjective /ˈdɔːr.mənt/

Dormant

Meaning
inactive; sleeping; temporarily suspended; not currently active
Example
The volcano has been dormant for over a century.
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 verb /ˈduːdəl/

doodle

Meaning
To draw or scribble absentmindedly, often while thinking about something else.
Example
She doodled flowers in the corner of her notebook during class.
C1 adjective /ˈdɒdʒi/

Dodgy

Meaning
suspicious; questionable; unreliable; risky or dangerous
Example
That deal sounds dodgy to me.
C1 noun /ˈdaɪnəˌmoʊ/

dynamo

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.
C1 noun /dɪˈstɔːrʃən/

distortion

Meaning
the action of twisting, changing, or misrepresenting the shape, sound, or truth of something
Example
There was a distortion in the radio signal.
C1 noun /dɪˈspɜːrʒən/

dispersion

Meaning
The action or process of distributing things or people over a wide area.
Example
The dispersion of seeds by the wind helps plants reproduce.
C1 noun /ˌdɛtəˈneɪʃən/

detonation

Meaning
The act of exploding or causing something to explode.
Example
The sudden detonation shook the entire building.
C1 adjective dɪ ˈskrɛʃ.ən.er.i

discretionary

Meaning
Available for use at the discretion of the user; not required or mandatory.
Example
He set aside some discretionary income for travel.
C1 adjective /dɪˈreɪndʒd/

deranged

Meaning
mentally disturbed or insane; behaving irrationally
Example
The deranged man shouted nonsense in the street.
C1 noun delˈteɪɪk ˈlændskeɪp

deltaic landscape

Meaning
A geographical area formed by sediment deposits at the mouth of a river, creating a triangular land formation.
Example
Bangladesh has a unique deltaic landscape.
C1 verb /dɪˈvɒlv/

devolve

Meaning
To pass power, responsibility, or duties to another person or group.
Example
The responsibility will devolve on the new manager.
C1 noun /ˌdɒmɪˈneɪʃən/

domination

Meaning
the exercise of control or influence over someone or something
Example
The empire sought domination over its neighbors.
C1 verb /dɪˈmiːn/

demean

Meaning
to cause someone to lose dignity or respect
Example
The manager demeaned his employees with rude remarks.
C1 noun ˌdɪs.æmˌbɪɡ.juˈeɪ.ʃən

disambiguation

Meaning
The removal of ambiguity by making something clear and unambiguous.
Example
The AI system applies disambiguation to refine text understanding.
C1 verb /ˈdræm.ə.taɪz/

dramatize

Meaning
to present a story in a dramatic way, or to exaggerate something
Example
The novel was dramatized into a popular TV series.
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 /djuːˈɛt/

duet

Meaning
a musical performance by two singers or instrumentalists
Example
They sang a beautiful duet together on stage.
C1 noun /dɪˈprɛsənt/

depressant

Meaning
A drug that reduces functional or nervous activity in the body.
Example
Alcohol acts as a depressant on the central nervous system.
C1 verb /dɪˈfjuːz/

diffuse

Meaning
to spread over a wide area or among a large number of people
Example
The smell of fresh bread diffused through the entire house.
C1 verb /daɪˈluːt/

dilute

Meaning
To make a liquid thinner or weaker by adding water or another solvent.
Example
You should dilute the juice with water before serving it to children.
C1 noun dɪˈsʌɪsɪvnɪs

decisiveness

Meaning
The ability to make decisions quickly and effectively.
Example
His decisiveness during the crisis saved the company.
C1 adjective /ˈdwɪndlɪŋ/

dwindling

Meaning
Gradually reducing in number, size, or strength.
Example
The villagers relied on dwindling water supplies.
C1 verb /diːˈfjuːz/

defuse

Meaning
To make a situation less dangerous, tense, or explosive; to remove a fuse from a bomb.
Example
The negotiator helped defuse the tense situation.
C1 adjective /dɪˈfɪʃənt/

Deficient

Meaning
not having enough of a specified quality or ingredient; lacking or inadequate
Example
His diet was deficient in essential vitamins.
C1 verb /dɪˈɡreɪd/

degrade

Meaning
To lower in dignity, quality, or value; to treat with disrespect or to deteriorate.
Example
Harsh words can degrade a person's confidence.
C1 noun /dɪˈvaɪzər/

divisor

Meaning
A number by which another number is divided.
Example
In the equation 12 ÷ 3, the number 3 is the divisor.
C1 adjective dɪˈskrɪmɪnətɔːri

discriminatory

Meaning
Making or showing an unfair or prejudicial distinction between different categories of people or things.
Example
Discriminatory policies triggered protests.
C1 adjective /dɪˈvaʊt/

devout

Meaning
Deeply religious or sincere.
Example
He is a devout believer who prays every day.
C1 noun ˌdɪdʒɪˈnɛəreɪʃən

degeneration

Meaning
The process of decline or deterioration in structure or function.
Example
The degeneration of brain cells leads to cognitive decline.
C1 noun /dɪˌnʌnsiˈeɪʃən/

denunciation

Meaning
the public condemnation or accusation of someone or something
Example
The journalist's article was a strong denunciation of corruption.
C1 noun /ˈdɑː.mə.saɪl/

domicile

Meaning
A person's legal residence or permanent home.
Example
He declared Canada as his legal domicile.
C1 noun /dɪˈlɪriəm/

delirium

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.
C1 verb /dɪsˈhɑːrtn/

dishearten

Meaning
to cause someone to lose determination or confidence; to discourage
Example
The constant rejection letters began to dishearten the young writer.
C1 phrase ˌdɪp.ləˈmæt.ɪk rɛz.əˈluː.ʃən

diplomatic resolution

Meaning
A peaceful solution to conflicts through negotiation and diplomatic channels.
Example
A diplomatic resolution is necessary for peace.
C1 adjective /ˈdɑːsəl/ or /ˈdəʊsaɪl/

docile

Meaning
easily managed, taught, or controlled; submissive
Example
The docile puppy quickly learned new tricks.
C1 noun /daɪˈvɜː.dʒəns/

divergence

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.
C1 adjective daɪˈvɜː.dʒənt

divergent

Meaning
Tending to be different or develop in different directions
Example
Divergent policies create challenges in collaboration.
C1 noun /dɪˈsɜːn.mənt/

discernment

Meaning
The ability to judge well or understand something correctly; keen insight.
Example
His discernment in business decisions made him successful.
C1 verb /dɪˈdjuːs/

deduce

Meaning
to reach a conclusion by reasoning or inference
Example
From the evidence, the detective deduced that the suspect was lying.
C1 noun /ˌdɪsəˈbiːdiəns/

disobedience

Meaning
failure or refusal to obey rules, laws, or authority
Example
The child's disobedience worried his parents.
C1 adjective /diːˈsɛntrəlaɪzd/

decentralized

Meaning
Controlled by several local offices or authorities rather than one single one.
Example
The decentralized system allowed for more control at local levels.
C1 noun /dɪˈvɪnɪti/

divinity

Meaning
The quality or state of being divine; a deity.
Example
The priest spoke about the divinity of the soul.
C1 verb /drɛntʃ/

drench

Meaning
to make someone or something completely wet
Example
The sudden rain drenched the players on the field.
C1 noun /ˌdɪspəˈzɪʃən/

disposition

Meaning
A person's usual attitude or temperament; arrangement or tendency.
Example
She has a cheerful disposition despite the difficulties.
C1 noun ˌdɛməˈɡræfɪk trænˈzɪʃən

demographic transition

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.
C1 verb /dɪˈmoʊt/

demote

Meaning
to reduce to a lower rank or position
Example
The manager decided to demote the employee for poor performance.
C1 noun /dɪˈmaɪz/

demise

Meaning
Death or end of something, especially the end of an institution or system.
Example
The sudden demise of the company shocked investors.
C1 verb /ˌdɪsɪnˈɡeɪdʒ/

disengage

Meaning
To release or detach oneself from something; to withdraw.
Example
He tried to disengage from the heated argument.
C1 verb ˈdwɪn.dl

dwindle

Meaning
To diminish gradually in size, amount, or strength; to become progressively smaller.
Example
His savings dwindled due to unexpected expenses.
C1 noun ˈdɛf.ər.əns

deference

Meaning
Humble submission and respect.
Example
He showed deference to his elderly mentor.
C1 adjective /ˈdɪn.dʒi/

Dingy

Meaning
dark and dirty; gloomy; dull in color
Example
The old building had dingy walls that needed painting.
C1 verb /ˈdiːmɑːrˌkeɪt/

demarcate

Meaning
to set the boundaries or limits of something
Example
The land was demarcated with fences to avoid disputes.
C1 verb /diːm/

deem

Meaning
to regard or consider in a specified way
Example
The project was deemed a success by the board.
C1 noun /dɪsˈlɛksiə/

dyslexia

Meaning
A learning disorder characterized by difficulty reading due to problems identifying speech sounds and decoding words.
Example
The teacher used special methods to help the student with dyslexia.
C1 adjective /dɪˈbeɪst/

debased

Meaning
having lost quality, value, or moral character
Example
The debased currency lost the trust of the people.
C1 noun /drɑːft/ (UK), /dræft/ (US)

draught

Meaning
a current of cool air in a room or another confined space; also a portion of liquid, especially beer, served from a barrel or cask
Example
She closed the window to keep out the cold draught.
C1 noun /ˈdɑːsieɪ/

dossier

Meaning
A collection of documents about a particular person, event, or subject.
Example
The lawyer presented a dossier of evidence to the court.
C1 noun /dɜːrθ/

dearth

Meaning
A scarcity or lack of something.
Example
There was a dearth of food during the famine.
C1 verb, noun /dɪsˈkrɛdɪt/

discredit

Meaning
To harm the reputation of someone or something; loss of respect or credibility.
Example
The scandal discredited the politician in the eyes of the public.
C1 noun /diːˈkrɪp.ʃən/

decryption

Meaning
The process of converting encrypted data back into its original form so it can be understood.
Example
Hackers attempted decryption of classified data.
C1 adverb /ˈduːli/

Duly

Meaning
in accordance with what is required or appropriate; at the proper time
Example
The documents were duly signed and submitted.
C1 noun dəˌmɛstɪˈkeɪʃən

domestication

Meaning
The process of taming an animal and keeping it as a pet or for farm produce.
Example
Domestication of animals has been crucial for human survival.
C1 noun /ˌdɪfəˈrɛnʃɪˈeɪʃən/

differentiation

Meaning
The action or process of differentiating or distinguishing between things.
Example
Differentiation from competitors can create a unique market position.
C1 verb /ˈdɪs.ɪ.peɪt/

dissipate

Meaning
To disappear or cause to disappear gradually.
Example
The tension in the room slowly dissipated.
C1 verb /dɪsˈbænd/

disband

Meaning
to break up and stop functioning as a group or organization
Example
The club decided to disband after twenty years of activity.
C1 noun dɪˈskrep.ən.siz

discrepancies

Meaning
Differences between things that should be the same
Example
Discrepancies in regulations delay progress.
C1 adjective /dɪˈfɛnsəbəl/

defensible

Meaning
Capable of being protected against attack or criticism; justifiable.
Example
Her decision was legally defensible.
C1 noun /ˌdɪs.ɪˈluː.ʒən.mənt/

disillusionment

Meaning
A feeling of disappointment resulting from the discovery that something is not as good as one believed it to be.
Example
Many people experience disillusionment after unrealistic expectations.
C1 noun dɪˈdʒɛnəˌreɪtɪv dɪˈzizɪz

degenerative diseases

Meaning
Medical conditions that involve the deterioration or progressive decline of tissues, organs, or functions
Example
Degenerative diseases are common in an aging population.
C1 noun /dɪsˈɒn.ər/

Dishonour

Meaning
a state of shame or disgrace; lack of honor or integrity; failure to fulfill obligations
Example
Breaking his promise brought dishonour to his name and family legacy.
C1 adjective /ˈdesələt/

Desolate

Meaning
deserted; lonely; barren
Example
The abandoned village looked desolate and empty.
C1 noun /ˈdɪŋɡi/

dinghy

Meaning
a small boat, often carried or towed by a larger vessel, used for short trips or as a lifeboat
Example
They rowed the dinghy back to the yacht.
C1 verb /dɪˈpriːʃieɪt/

depreciate

Meaning
to reduce in value over time
Example
Cars tend to depreciate quickly in their first few years.
C1 verb /dɪˈpliːt/

deplete

Meaning
to reduce the quantity or supply of something
Example
The long war has depleted the country's resources.
C1 verb /dɪˈfrɔːd/

defraud

Meaning
to illegally take money or valuables from someone by deception
Example
The company was accused of trying to defraud investors.
C1 noun /dɪsˈsɜːrvɪs/

disservice

Meaning
A harmful action; something that does damage rather than help.
Example
Spreading false information is a disservice to the community.
C1 noun /ˌdiːˈmer.ɪt/

Demerit

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.
C1 adjective /dɪˈraɪsɪv/

derisive

Meaning
Expressing contempt or ridicule.
Example
She gave a derisive laugh at his attempt to sing.
C1 noun /dɪˌnɒmɪˈneɪʃən/

denomination

Meaning
a recognized autonomous branch of the Christian Church; a unit of value or currency
Example
The church belongs to a Protestant denomination.
C1 verb /ˌdiːˈbʌŋk/

debunk

Meaning
Expose the falseness or hollowness of (a myth, idea, or belief).
Example
Scientists debunked the myth that vaccines cause autism.
C1 noun /ˈdjuːplɛks/

duplex

Meaning
A house or apartment divided into two separate residences.
Example
They live in a duplex near the city center.
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 /ˌdaɪəˈrɑːmə/

diorama

Meaning
a three-dimensional model representing a scene, often with miniature figures
Example
The museum displayed a diorama of an ancient village.
C1 noun /ˈdɒɡmə/

dogma

Meaning
A principle or set of principles laid down by an authority as incontrovertibly true.
Example
The religious leader strictly adhered to traditional dogma.
C1 noun /ˌdɜːrməˈtɑːlədʒi/

dermatology

Meaning
The branch of medicine concerned with the skin and its diseases.
Example
He studied dermatology at medical school.
C1 adjective /daɪˈvɜːrsɪfaɪd/

diversified

Meaning
Made or having variety in form, nature, or content.
Example
The company adopted a diversified business strategy to reduce risks.
C1 noun /ˈdɛspɒt/

despot

Meaning
a ruler with absolute power, often ruling in a cruel or oppressive way
Example
The despot ruled the nation with fear and violence.
C1 noun dɛkˈstɛr.ɪ.ti

dexterity

Meaning
Skill in performing tasks, especially with the hands; mental skill or adroitness.
Example
His dexterity in playing the piano amazed the audience.
C1 noun /dɪˈten.ʃən/

Detention

Meaning
the action of detaining someone or being detained in official custody
Example
The student received detention for repeatedly disrupting the class.
C1 adjective /dæft/

daft

Meaning
Silly or foolish.
Example
It was a daft idea to go hiking without water.
C1 verb /ˈdɛprɪˌkeɪt/

deprecate

Meaning
to express disapproval of something
Example
The teacher deprecated the use of slang in academic essays.
C1 noun ˈdɪskɔrd

discord

Meaning
Disagreement or conflict between people or ideas.
Example
Discord among people disrupts societal stability.
C1 verb /ˌdɪskənˈsɜːrt/

disconcert

Meaning
To unsettle, confuse, or disturb the composure of someone.
Example
The sudden change of plans disconcerted the team.