degeneration
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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 /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 /daɪˈsɛkʃən/

dissection

Meaning
the act of cutting apart or analyzing something in detail, especially a body or structure
Example
The dissection of the specimen revealed important details about its structure.
C1 adjective daɪˈvɜː.dʒənt

divergent

Meaning
Tending to be different or develop in different directions
Example
Divergent policies create challenges in collaboration.
C1 adjective /dɪˈlæpɪˌdeɪtɪd/

dilapidated

Meaning
Fallen into disrepair or ruin due to neglect or age.
Example
The family lived in a dilapidated house at the edge of town.
C1 noun dɪˌzɝː.t̬ə.fɪˈkeɪ.ʃən

desertification

Meaning
The process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
Example
Deforestation accelerates desertification.
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 adjective /dɪˈplɔːrəbl/

deplorable

Meaning
deserving strong condemnation; shockingly bad in quality
Example
The refugees were living in deplorable conditions.
C1 adjective /ˌdɪfəˈrɛnʃəl/

differential

Meaning
Relating to or showing a difference; involving a distinction.
Example
There is a differential treatment between the two groups.
C1 noun dɪˈsʌɪsɪvnɪs

decisiveness

Meaning
The ability to make decisions quickly and effectively.
Example
His decisiveness during the crisis saved the company.
C1 noun ˌdɪs.ɪnˈfek.ʃən

disinfection

Meaning
The process of destroying harmful microorganisms to prevent infection.
Example
Kitchen appliances require frequent disinfection.
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 /daɪˈvɜː.ʃən/

Diversion

Meaning
the action of turning something aside from its course; an activity that diverts the mind
Example
The road closure forced a diversion through the countryside for all travelers.
C1 verb /dəˈmɛstɪkeɪt/

domesticate

Meaning
to tame an animal for use by humans; to adapt something for domestic use
Example
Humans domesticated dogs thousands of years ago.
C1 noun /ˈdaʊn.pɔːr/

Downpour

Meaning
a heavy fall of rain; a sudden heavy rainfall
Example
The sudden downpour caught everyone off guard and soaked the outdoor event.
C1 verb /dɪsˈlɒdʒ/

dislodge

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.
C1 verb /dɪsˈkleɪm/

disclaim

Meaning
to deny responsibility or connection with something
Example
The company disclaimed responsibility for the accident.
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 /daɪˈvʌldʒ/

divulge

Meaning
to make known something private, secret, or previously unknown
Example
She refused to divulge the source of her information.
C1 noun /ˈdɒktrɪn/

doctrine

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.
C1 noun dɪˈfleɪʃən

deflation

Meaning
Reduction of the general level of prices in an economy.
Example
Deflation often leads to decreased consumer spending.
C1 verb /dɪsˈpleɪs/

displace

Meaning
to force someone or something out of their usual or original position; to replace or substitute
Example
The new technology will displace many traditional manufacturing jobs.
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 /ˌdɪsɪnˈɡeɪdʒ/

disengage

Meaning
To release or detach oneself from something; to withdraw.
Example
He tried to disengage from the heated argument.
C1 adjective ˈdɪs.pər.ət

disparate

Meaning
containing elements very different from one another.
Example
Their opinions were disparate, leading to debates.
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 noun /djʊˈrɛs/

duress

Meaning
threats, violence, or pressure used to force someone to do something
Example
She signed the contract under duress.
C1 noun /ˈdræm.ə.tɪst/

dramatist

Meaning
a person who writes plays
Example
Shakespeare is one of the greatest dramatists in history.
C1 adjective /ˈdesələt/

Desolate

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

disfigure

Meaning
to spoil or damage the appearance of something
Example
The fire disfigured the old building.
C1 noun/verb /dɛnt/

dent

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.
C1 noun /dɪˈmiːnər/

demeanour

Meaning
a person's outward behavior or appearance
Example
Her calm demeanour impressed everyone during the meeting.
C1 adjective /dɪsˈhɑːrtənd/

Disheartened

Meaning
discouraged; feeling dejected; losing hope or confidence
Example
She felt disheartened after failing the exam twice.
C1 noun /ˈdrɪz.əl/

Drizzle

Meaning
light rain falling in very fine drops; a very light rainfall
Example
The gentle drizzle continued throughout the morning, making everything misty.
C1 noun /ˌdɜːrməˈtɑːlədʒi/

dermatology

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

dubious

Meaning
Hesitating or doubting; not to be relied upon.
Example
She gave him a dubious look after hearing his excuse.
C1 adjective /dæft/

daft

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

Deceit

Meaning
the action or practice of deceiving someone by concealing or misrepresenting the truth
Example
His deceit was discovered when the truth about his qualifications came to light.
C1 adjective /ˈdæʃ.ɪŋ/

Dashing

Meaning
stylish and confident; lively and energetic; attractive and charming
Example
He looked dashing in his new suit.
C1 adjective /ˈdaɪ.si/

dicey

Meaning
Risky or unpredictable; potentially dangerous.
Example
Investing in that company looks pretty dicey right now.
C1 noun /ˌdɛtəˈneɪʃən/

detonation

Meaning
The act of exploding or causing something to explode.
Example
The sudden detonation shook the entire building.
C1 verb /ˌdiː.kəmˈprɛs/

decompress

Meaning
To relax and recover from stress or pressure.
Example
Taking deep breaths helps to decompress after a stressful day.
C1 adjective /dɪˈspɜːrst/

dispersed

Meaning
Scattered or spread across a wide area.
Example
The dispersed population made it difficult to provide public services.
C1 noun /ˈdɪs.ə.nəns/

dissonance

Meaning
Disagreement, lack of harmony, conflict between ideas or beliefs.
Example
The cultural dissonance created misunderstandings.
C1 adjective /dɪˈraɪsɪv/

derisive

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

dune

Meaning
A hill or ridge of sand formed by the wind, usually found in deserts or near beaches.
Example
The children played on the sand dune by the beach.
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 /dræb/

drab

Meaning
Dull, lacking brightness or interest; monotonous.
Example
The room looked drab with its gray walls and dim lighting.
C1 noun ˈdaɪ.nə.sti

dynasty

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.
C1 verb /dɪˈsweɪd/

dissuade

Meaning
To persuade someone not to do something.
Example
She tried to dissuade him from quitting his job.
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 noun /ˈdɪm.pəl/

Dimple

Meaning
a small depression in the flesh, either one that exists permanently or one that forms when smiling
Example
Her charming dimples appeared whenever she smiled at the children.
C1 noun /diːˌtɒksɪfɪˈkeɪʃən/

detoxification

Meaning
The process of removing toxic substances from a living organism.
Example
Detoxification helps to cleanse the body of harmful substances.
C1 noun /ˈdɛdlɒk/

deadlock

Meaning
a situation in which progress is impossible because of disagreement
Example
Negotiations reached a deadlock after neither side agreed to compromise.
C1 noun /dɪˈmiːnər/

demeanor

Meaning
a person's outward behavior or appearance
Example
Her calm demeanor impressed everyone at the meeting.
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 /ˈdɪsənˌtɛri/

dysentery

Meaning
An infection of the intestines resulting in severe diarrhea with blood and mucus.
Example
Many soldiers suffered from dysentery during the war.
C1 noun ˈdɪk.ʃən

diction

Meaning
The style of pronunciation and word choice in speaking or writing.
Example
A strong diction enhances communication skills.
C1 verb /ˌdɪsɪmˈbɑːrk/

disembark

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

depository

Meaning
a place where things are stored or deposited, especially financial assets
Example
The national depository safeguards all government bonds.
C1 verb dɪˈlɪnieɪt

delineate

Meaning
To describe or portray something precisely
Example
The artist delineated the scene in intricate detail.
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 verb /dɪˈzɪst/

desist

Meaning
to stop doing something, especially an action considered wrong or undesirable
Example
The judge ordered the company to desist from unfair practices.
C1 noun, adjective /dɪˈrɪvətɪv/

derivative

Meaning
Something that is based on another source; in math, a measure of how a function changes.
Example
The film was criticized for being too derivative of earlier works.
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 /ˌdɪs.əˈreɪ/

disarray

Meaning
A state of disorganization or untidiness; confusion or disorder.
Example
His desk was in complete disarray.
C1 adjective /dɪsˈsɪmɪlər/

dissimilar

Meaning
Not alike; different.
Example
Though they are twins, their personalities are dissimilar.
C1 verb /ˈdɪsləkeɪt/

dislocate

Meaning
To disturb the normal position of something, especially a joint in the body.
Example
He dislocated his shoulder while playing football.
C1 noun /ˈdɛljuːdʒ/

deluge

Meaning
A severe flood; an overwhelming quantity of something.
Example
The town was hit by a deluge of rain in just a few hours.
C1 noun /ˈdɛməɡɒɡ/

demagogue

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.
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 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 /dɪˈreɪndʒd/

deranged

Meaning
mentally disturbed or insane; behaving irrationally
Example
The deranged man shouted nonsense in the street.
C1 adjective /dɪˈmɒnstrəbl/

demonstrable

Meaning
clearly able to be shown or proven
Example
There was demonstrable evidence that he was innocent.
C1 noun /ˌdɪsərˈteɪʃən/

dissertation

Meaning
A long piece of writing on a particular subject, usually written for a university degree.
Example
She spent two years writing her doctoral dissertation.
C1 adjective /dɪˈvɔɪd/

devoid

Meaning
Completely lacking or without something.
Example
His speech was devoid of any real emotion.
C1 verb /ˈdɛnɪˌɡreɪt/

denigrate

Meaning
to criticize unfairly; to belittle or disparage someone or something
Example
He was quick to denigrate the achievements of his colleagues.
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 /ˌdiːˈbʌŋk/

debunk

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

dwindling

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

disprove

Meaning
to show that something is false or wrong
Example
The scientist worked hard to disprove the old theory.
C1 noun /ˈdɪɡnɪˌtɛri/

dignitary

Meaning
a person considered to be important because of high rank or office
Example
Several foreign dignitaries attended the state banquet.
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 verb /dɪˈsɛləˌreɪt/

decelerate

Meaning
to reduce speed; to slow down
Example
The car began to decelerate as it approached the traffic light.
C1 adjective /dɪsˈkɔːrdənt/

discordant

Meaning
disagreeing or clashing; harsh and jarring in sound
Example
The discordant notes of the band hurt our ears.
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 adjective, noun /ˈdɛrəlɪkt/

derelict

Meaning
in poor condition due to neglect or disuse; a homeless or neglected person
Example
The old factory stood derelict for decades.
C1 noun dɪˈpliː.ʃən

depletion

Meaning
The gradual reduction or exhaustion of a resource or substance.
Example
Overuse of groundwater leads to depletion of water resources.
C1 adjective /dɪˈrɒɡətɔːri/

derogatory

Meaning
Showing a critical or disrespectful attitude.
Example
The article contained derogatory comments about the politician.
C1 noun /ˌdez.ɪɡˈneɪ.ʃən/

Designation

Meaning
the action of choosing someone for a position; a name, title, or official status
Example
His designation as team leader came with additional responsibilities and authority.
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 adjective /dɪˈmɒnstrətɪv/

demonstrative

Meaning
openly showing feelings, especially affection or emotion
Example
She was very demonstrative with her affection towards her friends.
C1 noun ˈdɪl.ɪ.dʒəns

diligence

Meaning
Careful and persistent work or effort.
Example
Success requires patience and diligence.
C1 noun /ˈdæmpər/

damper

Meaning
something that reduces or lessens the force, effect, or excitement
Example
The cancellation of the trip put a damper on their enthusiasm.
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 /ˌdiː.viˈeɪ.ʃən/

Deviation

Meaning
the action of departing from an established course; a departure from usual standards
Example
Any deviation from the established procedure must be reported immediately.
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 /ˌdep.rɪˈveɪ.ʃən/

deprivation

Meaning
The damaging lack of material benefits considered to be basic necessities in a society.
Example
Sleep deprivation affects cognitive function.
C1 noun /ˈded.lɑk/

Dead-lock

Meaning
a situation in which no progress is possible; complete standstill
Example
The negotiations reached a deadlock when neither side would compromise.
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 adjective /dɪˈsɜːrnəbl/

discernible

Meaning
able to be seen, recognized, or understood
Example
There was a discernible change in his behavior.
C1 adjective /drəˈkoʊniən/

draconian

Meaning
Extremely harsh and severe, especially laws or rules.
Example
The new regulations were criticized as draconian.
C1 noun /ˌdɪstɪˈleɪʃən/

distillation

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.
C1 verb /dɪˈfaɪl/

defile

Meaning
to pollute, corrupt, or make dirty
Example
The river was defiled by industrial waste.
C1 verb /dɪˈsɛm.ɪ.neɪt/

disseminate

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.
C1 noun /dʌsk/

Dusk

Meaning
the period of the day when daylight is fading; twilight
Example
They walked along the beach during dusk, watching the sunset.
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 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 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 verb /ˌdɪskənˈsɜːrt/

disconcert

Meaning
To unsettle, confuse, or disturb the composure of someone.
Example
The sudden change of plans disconcerted the team.
C1 noun /ˈdrʌdʒəri/

drudgery

Meaning
Hard, menial, or dull work.
Example
She wanted to escape the drudgery of her daily routine.
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 /djuːˈɛt/

duet

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

disheveled

Meaning
Untidy, messy, or in disorder, especially of hair or clothing.
Example
He arrived with disheveled hair and wrinkled clothes.
C1 adjective /ˈdɒdʒi/

Dodgy

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

depreciation

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.
C1 verb /dɪˈflɛkt/

deflect

Meaning
to cause something to change direction; to avoid answering directly
Example
The shield deflected the incoming arrow.
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 noun ˌdɛɡrəˈdeɪʃən

degradation

Meaning
The condition or process of degrading or being degraded.
Example
Soil degradation due to overuse is a growing issue.
C1 verb /ˈdæmpən/

dampen

Meaning
to make something slightly wet; to make something less strong, active, or intense
Example
The rain dampened the excitement of the outdoor concert.