dissertation
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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.
B2 noun, verb /ˈdeɪ.bjuː/

debut

Meaning
The first public appearance or performance of someone or something.
Example
The young actor made his debut on the big stage.
B2 adjective /dɪˈpɛndəbl/

dependable

Meaning
able to be trusted or relied on; consistently reliable
Example
She is a dependable colleague who always meets deadlines.
B2 noun /ˈdiːmən/

demon

Meaning
an evil spirit or devil
Example
The story was about a demon who haunted the village.
B2 noun /ˈdreɪ.nɪdʒ/

drainage

Meaning
the system or process by which water or other liquids are drained away
Example
Poor drainage caused flooding in the neighborhood.
C1 verb/adjective /dɪˈdʒɛnəreɪt/

degenerate

Meaning
To decline or deteriorate in quality, character, or condition; or someone with low moral standards.
Example
The once thriving empire began to degenerate into chaos.
C1 adjective /dɪˈsɜːrnəbl/

discernible

Meaning
able to be seen, recognized, or understood
Example
There was a discernible change in his behavior.
B2 verb /dɪˈskrɪmɪˌneɪt/

discriminate

Meaning
To treat someone unfairly based on race, gender, or other differences; or to recognize a distinction.
Example
The law prohibits employers from discriminating against women.
A2 noun /drʌɡ/

drug

Meaning
a substance used as a medicine or an illegal addictive substance
Example
The doctor prescribed a new drug for the illness.
B1 noun /dɪˈtɛktɪv/

detective

Meaning
a person whose job is to investigate and solve crimes
Example
The detective solved the mystery in just two days.
C1 adjective /dɪsˈrɛpjətəbl̩/

disreputable

Meaning
having a bad reputation; not considered respectable or trustworthy
Example
The journalist avoided staying in the disreputable part of town.
A2 verb /drɔː/

draw

Meaning
to create pictures or designs with a pencil or pen
Example
She draws beautiful landscapes in her spare time.
B2 noun /ˈdræɡ.ən.flaɪ/

Dragon-fly

Meaning
a large insect with four transparent wings that lives near water
Example
The dragonfly hovered over the pond.
A2 verb dɪˈvɛləp

develop

Meaning
To grow or bring to a more advanced or effective state; to start to exist, experience, or possess gradually.
Example
Develop a brand based on your passion and skills.
C2 noun /ˌdɛrɪˈlɪkʃən/

dereliction

Meaning
the state of being abandoned; neglect of duty
Example
The officer was charged with dereliction of duty.
B2 adjective /daɪˈnæm.ɪk/

dynamic

Meaning
Characterized by constant change, activity, or progress.
Example
Life flows in a dynamic stream.
C2 verb /dɪˈtruːd/

detrude

Meaning
To thrust or force something downward or outward.
Example
The violent waves detruded rocks from the cliff.
B1 noun /ˈdɛdˌlaɪnz/

deadlines

Meaning
The latest time or date by which something should be completed.
Example
Setting deadlines helps finish tasks.
C2 verb /dɪˈnjuːd/

denude

Meaning
to strip something of its covering, possessions, or assets
Example
The forest was denuded of trees by illegal logging.
C2 noun /ˈdaɪˌsɪləbəl/

disyllable

Meaning
a word consisting of two syllables
Example
The word 'happy' is a disyllable.
C1 adjective /dɪsˈkwaɪətɪŋ/

disquieting

Meaning
Causing worry, unease, or anxiety.
Example
The news report was deeply disquieting to the public.
A2 noun /ˈdjuː.ti/

Duty

Meaning
something that one is expected or required to do; moral or legal obligation
Example
It is our duty as citizens to vote in elections.
C2 adjective /dɪˈsɛnʃənt/

dissentient

Meaning
Expressing or holding opinions that are opposed to the majority or official view.
Example
Only a few dissentient voices were heard during the debate.
C2 verb /dɪˈpreɪv/

deprave

Meaning
to corrupt morally; to make someone immoral or wicked
Example
The novel was criticized for attempting to deprave the minds of young readers.
C2 verb /ˌdɪsəˈvaʊ/

disavow

Meaning
to deny responsibility for or connection with something
Example
He disavowed any involvement in the scandal.
B2 verb /ˌdɪskəˈnɛkt/

disconnect

Meaning
to detach or separate from a connection or source
Example
Please disconnect the charger from the power outlet.
C2 adjective /dɪˈstreɪ/

distrait

Meaning
deeply distracted or absent-minded, often due to worry or grief
Example
He looked distrait after hearing the sad news.
B2 adverb dɪˈlɪb.ər.ət.li

deliberately

Meaning
Consciously and intentionally; on purpose.
Example
The actions were deliberately planned to cause harm.
B2 adjective /dɪˌveləpˈmentl/

developmental

Meaning
relating to the process of growth or progress
Example
Early childhood is a crucial developmental stage for learning.
B1 verb /dæm/

damn

Meaning
to condemn or criticize strongly; used as an expletive to express anger or emphasis
Example
He damned the unfair system in his speech.
B2 verb /ˌdɪsɪnˈfɛkt/

disinfect

Meaning
to clean something thoroughly to destroy bacteria or viruses
Example
The nurse disinfected the wound before applying a bandage.
B1 noun /ˈdeə.ri/

Dairy

Meaning
a building or farm where milk is produced; products made from milk; a shop selling milk and milk products
Example
The local dairy provides fresh milk and cheese to the entire neighborhood.
B1 noun /dɜːrt/

Dirt

Meaning
a substance that makes something unclean; earth or soil; unclean matter
Example
After playing in the garden, the children were covered in dirt from head to toe.
C2 adjective /dɪsˈkʌmfɪtɪŋ/

discomfiting

Meaning
Causing unease, embarrassment, or discomfort.
Example
His discomfiting questions made everyone shift uncomfortably in their seats.
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 /dɪˈvɪnɪti/

divinity

Meaning
The quality or state of being divine; a deity.
Example
The priest spoke about the divinity of the soul.
B2 noun /dɪˈpen.dənt/

Dependent

Meaning
a person who relies on another for financial support; someone who depends on others
Example
As a tax dependent, she could not file her own tax return separately.
B2 verb /ˈdɛdɪkeɪt/

dedicate

Meaning
to devote time, effort, or oneself to a particular purpose or person
Example
She dedicated her life to helping the poor.
B2 noun /ˈdeɪtəbeɪs/

database

Meaning
a structured collection of data stored and accessed electronically
Example
The company's customer details are stored in a secure database.
C2 noun /ˈdɛkəˌlɔːɡ/

decalogue

Meaning
The Ten Commandments in the Bible; a set of fundamental rules or principles.
Example
The priest gave a sermon on the importance of the Decalogue.
B2 verb /dɪˈmɪnɪʃ/

diminish

Meaning
to make or become less; to reduce in size, importance, or value
Example
Over time, his influence in the company began to diminish.
B2 noun /ˌdaɪəɡˈnoʊsɪs/

diagnosis

Meaning
The identification of a disease, condition, or problem through examination of symptoms.
Example
The diagnosis confirmed that she had diabetes.
C1 adjective /dɪsˈpæʃənət/

dispassionate

Meaning
not influenced by strong emotion; impartial
Example
The judge remained dispassionate throughout the trial.
B1 verb /dɪˈspleɪ/

display

Meaning
to show or exhibit; to present for others to see
Example
The museum displays ancient artifacts.
C1 verb /ˌdɪsəˈlaʊ/

disallow

Meaning
to refuse to allow or accept something
Example
The referee disallowed the goal for offside.
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 verb dɪˈsaɪ.fɚ

decipher

Meaning
To convert something written in code into normal language; to succeed in understanding the meaning of something.
Example
It took hours to decipher the ancient script.
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.
B2 noun/verb /dɪˈspjuːt/

dispute

Meaning
a disagreement or argument about something important
Example
The two countries are in dispute over the border issue.
B2 noun ˌdiː.fɒr.ɪˈsteɪ.ʃən

deforestation

Meaning
The action of clearing a wide area of trees; the permanent destruction of forests in order to make the land available for other uses.
Example
Deforestation accelerates the loss of biodiversity.
C1 verb /dɪˈbɑːr/

debar

Meaning
To officially prevent someone from doing something.
Example
He was debarred from entering the competition due to cheating.
C2 noun /dɪˈfoʊliənt/

defoliant

Meaning
a chemical that causes leaves to drop from plants, often used in warfare or agriculture
Example
The army sprayed defoliant to clear the forest cover.
B2 verb /dreɪn/

drain

Meaning
to cause liquid to flow away from something; to remove liquid
Example
He drained the pasta before adding the sauce.
B2 noun /dɪˈrɛktəri/

directory

Meaning
a book or online resource listing people, businesses, or services with relevant details
Example
I need to find a plumber in the phone directory.
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.
A2 noun /dɪˈskʌʃən/

discussion

Meaning
The action or process of talking about something in order to reach a decision or share ideas.
Example
The project needs more discussion before moving forward.
B2 noun /ˈdɛsɪməl/

decimal

Meaning
A number system based on 10; a number expressed in the base-10 system.
Example
The number 0.75 is a decimal.
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 noun dɪˈtɜː.mɪ.nənt

determinant

Meaning
A factor that decisively affects the nature or outcome of something.
Example
Education is a key determinant of success.
C1 noun /ˈdaʊri/

dowry

Meaning
Property or money brought by a bride to her husband at marriage.
Example
The dowry tradition is still followed in some cultures.
C1 verb diːˈsɛn.sɪ.taɪz

desensitize

Meaning
To make someone less sensitive or reactive to something through repeated exposure.
Example
Constant exposure to violence can desensitize people.
C2 adjective /ˌdɛfəˈrɛnʃəl/

deferential

Meaning
Showing or expressing respect and high regard.
Example
He was always deferential toward his teachers.
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 /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.
B2 noun /dɪˌskrɪm.ɪˈneɪ.ʃən/

Discrimination

Meaning
the unjust or prejudicial treatment of different categories of people; recognition of difference
Example
The company was sued for racial discrimination in their hiring practices.
C2 noun /ˈdɛvɪltrɪ/

deviltry

Meaning
Cruel or malicious behavior; mischief with an evil aspect.
Example
The villain’s deviltry terrified the townsfolk.
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.
B2 noun /dɪsˈmɪsl̩/

dismissal

Meaning
the act of removing someone from their job; the act of treating something as unimportant
Example
His unfair dismissal led to a lawsuit against the company.
B2 adjective /ˈduː.əl/

Dual

Meaning
having two parts or consisting of two elements; double
Example
She has dual citizenship of both countries.
B2 verb /ˈdɑːrkən/

darken

Meaning
to make or become dark; to reduce brightness or light
Example
The clouds began to darken the sky before the storm.
B1 noun /ˈdaɪ.ə.lɑːɡ/

Dialogue

Meaning
a conversation between two or more people; discussion aimed at exploration of a subject
Example
The political leaders engaged in meaningful dialogue to resolve the conflict.
C2 noun /ˈduːti/

Dhuti

Meaning
a traditional Indian garment for men consisting of a piece of unstitched cloth worn around the waist and legs
Example
The elderly man wore a white dhuti during the religious ceremony.
B1 verb /dɪp/

dip

Meaning
to put something quickly into a liquid and take it out again
Example
She dipped her bread into the soup.
A2 noun dɪˈveləpmənt

development

Meaning
The process of developing or being developed; growth or progress.
Example
Development of Bengali society was hindered.
C2 adjective /ˈdɒdərɪŋ/

doddering

Meaning
Weak, shaky, or unsteady, especially due to old age.
Example
The doddering professor struggled to climb the stairs.
C2 noun /dɛnˈdrɒlədʒi/

dendrology

Meaning
the scientific study of trees and woody plants
Example
He is studying dendrology at the university.
C1 noun /ˈdeɪˌbreɪk/

daybreak

Meaning
The time in the morning when daylight first appears; dawn.
Example
They set out on their journey at daybreak.
B1 noun /dɪˈstrʌk.ʃən/

Destruction

Meaning
the action or process of causing damage to something so that it no longer exists
Example
The earthquake caused widespread destruction throughout the entire city.
C2 noun /ˌdɪsɪˈpeɪʃən/

dissipation

Meaning
the process of disappearing or wasting; excessive indulgence in pleasure
Example
The dissipation of his fortune left him in poverty.
C1 verb /dɪsˈkwɑːlɪfaɪ/

disqualify

Meaning
to officially prevent someone from participating or being eligible
Example
The referee decided to disqualify the player for cheating.
B2 noun /dɪˈstrækʃənz/

distractions

Meaning
Things that prevent someone from concentrating on something else.
Example
Eliminate distractions for better productivity.
B2 noun daɪˈlem.ə

dilemma

Meaning
A situation in which a difficult choice has to be made between two or more alternatives.
Example
She faced a moral dilemma at work.
C2 adjective /ˈdaʊ.di/

dowdy

Meaning
unfashionable, dull, or shabby in appearance
Example
She wore a dowdy dress to the party.
C2 noun /ˈdɛrɪk/

derrick

Meaning
A framework or tower used for supporting a crane, especially for oil drilling or lifting heavy loads.
Example
The workers assembled a derrick at the oil drilling site.
B2 noun /djʊˈreɪʃən/

duration

Meaning
the length of time that something continues
Example
The meeting lasted for the duration of two hours.
C2 noun /dɪˈpləʊmətɪst/

diplomatist

Meaning
A person skilled in diplomacy; another word for diplomat.
Example
The diplomatist handled the negotiations with great tact.
B2 noun /ˌdɪsəˈpruːvəl/

disapproval

Meaning
The expression of an unfavorable opinion or judgment
Example
Her parents showed clear disapproval of her decision to drop out of college.
B2 noun /dʌv/

Dove

Meaning
a small, gentle bird with soft cooing sounds, often white and symbolizing peace
Example
The white dove flew peacefully across the blue sky.
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.
B2 noun /ˈdʌmi/

dummy

Meaning
a model or replica of a human used for practice, display, or testing; also a term for a foolish person
Example
The tailor used a dummy to display the dress.
B2 adjective /dɪˈstɪŋɡwɪʃt/

Distinguished

Meaning
notable; honored; famous; having a dignified appearance or manner
Example
He is a distinguished professor at the university.
C1 verb /dɪˈfeɪs/

deface

Meaning
to spoil the surface or appearance of something, especially by writing or drawing on it
Example
The vandals defaced the wall with graffiti.
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.
A2 adjective /draɪ/

Dry

Meaning
free from moisture or liquid; not wet; lacking interest or excitement
Example
The desert has very dry climate.
C1 noun /ˈdaɪəˌlɛkt/

dialect

Meaning
A particular form of a language spoken in a specific region or by a specific group.
Example
He speaks a dialect of Bengali that is common in rural areas.
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.
A1 verb /drɪŋk/

drink

Meaning
to take liquid into the mouth and swallow it
Example
I drink water every morning.
A2 noun /ˈdʌzən/

dozen

Meaning
a group of twelve
Example
She bought a dozen eggs from the market.
B1 verb /dɪˈvaɪd/

divide

Meaning
to separate into parts; to split or break apart
Example
Please divide the cake into eight pieces.
C1 verb /dɪˈkraɪ/

decry

Meaning
to publicly criticize or express strong disapproval of something
Example
Many activists decry the destruction of the rainforest.
B1 noun /dɒt/

dot

Meaning
a small round mark or spot
Example
She drew a red dot on the paper.
A2 noun /ˈdɛsktɒp/

desktop

Meaning
a computer designed to be used on a desk, typically with a separate monitor, keyboard, and mouse
Example
I keep my documents on the desktop for easy access.
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.
B2 verb /dɪˈzɒlv/

dissolve

Meaning
to melt or become liquid; to officially end or break up an agreement or organization
Example
The sugar will dissolve quickly in hot tea.
C2 adjective /ˈdɪsənənt/

dissonant

Meaning
Harsh and lacking harmony; conflicting.
Example
The orchestra produced a dissonant sound during rehearsal.
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.
B2 noun /dɪsˈɡʌst/

Disgust

Meaning
a feeling of revulsion or strong disapproval aroused by something unpleasant
Example
She expressed her disgust at the politician's corrupt behavior openly.
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 dɪˈspær.ə.ti

disparity

Meaning
A great difference or inequality.
Example
Disparity between countries must be reduced.
B2 noun /ˌdɪs.əˈbɪl.ə.ti/

Disability

Meaning
a physical or mental condition that limits a person's movements, senses, or activities
Example
Despite his physical disability, he became a successful athlete in wheelchair racing.
C1 noun /dɪˌlɪb.əˈreɪ.ʃənz/

deliberations

Meaning
Careful consideration and discussion before making decisions.
Example
Deliberations on sustainability continued for hours.
C1 noun /dɪˈfjuːʒən/

diffusion

Meaning
the spreading of something more widely or the movement of particles from high to low concentration
Example
The diffusion of information on social media is rapid.
C1 adjective /dɪˈfaɪənt/

Defiant

Meaning
boldly resistant or challenging; disobedient
Example
The defiant student refused to follow the rules.
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.
B1 adjective /dɪsˈɡʌstɪŋ/

disgusting

Meaning
extremely unpleasant or offensive; causing strong dislike or revulsion
Example
The smell coming from the trash can was absolutely disgusting.
A2 noun /dʌk/

Duck

Meaning
a waterbird with webbed feet and a broad flat bill
Example
The duck swam gracefully across the lake.
C2 noun /dəˈɡerəˌtaɪp/

daguerreotype

Meaning
An early type of photograph produced on a silver or silver-covered copper plate.
Example
The museum displayed a rare daguerreotype of Abraham Lincoln.
B2 verb /dʌmp/

dump

Meaning
to drop or dispose of something carelessly; to end a relationship suddenly
Example
He dumped all the trash into the bin.
C2 noun /ˈdrækmə/

drachma

Meaning
The basic monetary unit of Greece before the adoption of the euro.
Example
The old coin collection included a silver drachma.
C1 adjective deft

deft

Meaning
Neatly skillful and quick in one's movements; dexterous and adroit.
Example
The artist's deft hands created a masterpiece.
B1 noun /dɪˈzɜːrts/ (noun: reward or punishment deserved)

deserts

Meaning
what someone deserves, especially punishment or reward
Example
He finally got his just deserts for cheating in the exam.