acoustics
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C1 noun /əˈkuːstɪks/

acoustics

Meaning
the science of sound, or the properties of a space that affect how sound is heard
Example
The hall’s excellent acoustics made the orchestra sound rich and clear.
C1 adjective /dɪˈɡreɪdɪd/

degraded

Meaning
Reduced in quality, dignity, or condition.
Example
The villagers were forced to live in degraded conditions.
C1 noun /ˌsaɪkoʊˈθɛrəpi/

psychotherapy

Meaning
The treatment of mental disorder by psychological rather than medical means.
Example
She attended weekly psychotherapy sessions to cope with her anxiety.
C1 noun /ˈnjʊə.rəʊ.trænsˌmɪt.ərs/

neurotransmitters

Meaning
Chemical messengers that transmit signals across nerve synapses, affecting mood, behavior, and cognitive functions.
Example
Serotonin and dopamine are key neurotransmitters affecting mood.
C1 adjective kənˈkɝː.ənt

concurrent

Meaning
Existing, happening, or done at the same time.
Example
The conference had concurrent sessions on various topics.
C1 adjective /rɪˈsɔːrs ɪˈfɪʃ.ənt/

resource-efficient

Meaning
Using resources in a way that minimizes waste and maximizes productivity.
Example
Resource-efficient farming conserves water and energy.
C1 adjective /ˈseɪ.vər.i/

savory

Meaning
Having a pleasant salty or spicy taste; morally acceptable.
Example
The restaurant serves a variety of savory dishes.
C1 verb /ɪnˈfjuːz/

infuse

Meaning
to fill or spread through something; to instill a quality, idea, or feeling
Example
The teacher tried to infuse her students with a love for reading.
C1 adjective /səˈtɪrɪk/

satiric

Meaning
Relating to or using satire.
Example
The novel takes a satiric view of urban life.
C1 adjective /ˈswoʊlən/

swollen

Meaning
Enlarged or puffed up, usually due to injury, inflammation, or fluid accumulation
Example
Her ankle was swollen after she twisted it during the hike.
C1 noun /əˈboʊd/

abode

Meaning
a place of residence; a home
Example
They invited us to their humble abode.
C1 noun/verb /ˈdiːkɔɪ/

decoy

Meaning
something or someone used to lure or mislead
Example
The hunters used a wooden duck as a decoy.
C1 verb /pərˈplɛks/

perplex

Meaning
To confuse or puzzle someone.
Example
The complex instructions perplexed the students.
C1 adjective, noun /əbˈzɔːrbənt/

absorbent

Meaning
able to soak up liquid, moisture, or energy easily; a material or substance that absorbs
Example
This towel is highly absorbent and dries quickly.
C1 noun /ʃeɪl/

shale

Meaning
a fine-grained sedimentary rock that can be split into thin layers
Example
The region is rich in shale and natural gas deposits.
C1 adjective sɪˈmæn.tɪk

semantic

Meaning
Related to meaning in language; concerning the interpretation of words and sentences.
Example
AI models use semantic analysis to understand context.
C1 verb /ˈɪrɪˌɡeɪt/

irrigate

Meaning
to supply water to land or crops; to wash out a wound with water
Example
Farmers irrigate their fields during dry seasons.
C1 noun (plural) /ˈhɪntərlændz/

hinterlands

Meaning
Plural of hinterland; remote or less developed regions.
Example
Explorers traveled deep into the hinterlands of the country.
C1 noun/verb /stæmˈpiːd/

stampede

Meaning
A sudden, uncontrolled rush of people or animals; to cause a mass movement.
Example
The loud noise caused a stampede of the crowd.
C1 noun /ˈrɪdəns/

riddance

Meaning
The action of getting rid of something unwanted or unpleasant.
Example
His departure was considered a welcome riddance by the team.
C1 adjective /ˈæntɪkweɪtɪd/

antiquated

Meaning
Old-fashioned or outdated.
Example
The office still uses an antiquated filing system.
C1 adjective /ˈnɔːʃəs/

nauseous

Meaning
feeling like you are about to vomit; causing a feeling of sickness
Example
The smell of rotten food made her feel nauseous.
C1 noun /ˈɑːr.sən.əl/

arsenal

Meaning
A collection or storage place for weapons and military equipment.
Example
The army kept its weapons in a secure arsenal.
C1 adjective /ˌeɪˈsɛkʃuəl/

asexual

Meaning
Without sexual feelings, associations, or reproduction through sex.
Example
Many plants reproduce through asexual methods like budding or splitting.
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 adjective /kɑːrˈnɪv.ər.əs/

Carnivorous

Meaning
feeding on other animals; meat-eating
Example
Lions are carnivorous animals that hunt other animals for food.
C1 noun /ˈroʊ.lɪŋ bɔːrd/

Rolling board

Meaning
a flat wooden or marble surface used for rolling out dough
Example
She placed the dough on the rolling board.
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 noun /rɪˈkluːs/

recluse

Meaning
A person who lives alone and avoids other people; someone who lives a solitary life.
Example
The old man lived as a recluse in the mountains.
C1 verb /snɪər/

sneer

Meaning
to smile or speak in a mocking or contemptuous way
Example
She sneered at his attempt to sing.
C1 noun /ˈdiːviəns/

deviance

Meaning
Behavior that differs from accepted social or moral standards.
Example
The book studies deviance in urban youth culture.
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 adjective tɪˈneɪ.ʃəs

tenacious

Meaning
Not readily letting go of, giving up, or separated from an object that one holds, a position, or a principle; persistent.
Example
Her tenacious spirit helped her overcome hardships.
C1 adjective /ˈmiːɡər/

meager

Meaning
Lacking in quantity or quality; inadequate.
Example
He could barely survive on his meager salary.
C1 noun /beɪn/

bane

Meaning
A cause of great distress, harm, or annoyance.
Example
Traffic jams are the bane of city life.
C1 adjective /ˌdɪktəˈtɔːriəl/

dictatorial

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.
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 noun /ˌriː.pəˈkʌʃ.ən/

repercussion

Meaning
An unintended consequence occurring some time after an event or action.
Example
The economic crisis had severe repercussions on global trade.
C1 adjective /prəˈpɔːrʃənət/

proportionate

Meaning
Corresponding in size, degree, or intensity; balanced in relation.
Example
The punishment should be proportionate to the crime.
C1 noun /ˈmɪʃ.ən.ɛr.i/

Missionary

Meaning
A person sent on a religious mission to promote their faith in a foreign country
Example
The missionary spent years teaching and helping people in remote villages.
C1 adjective /kəˈrəʊsɪv/

corrosive

Meaning
tending to cause corrosion; harmful or destructive to materials or people
Example
The chemical is highly corrosive and should be handled with care.
C1 verb /hɜːrl/

hurl

Meaning
To throw something with great force.
Example
The boy hurled a stone into the river.
C1 noun /ˈeɪθiɪzəm/

atheism

Meaning
The belief that there is no God or gods.
Example
He declared his atheism openly despite social pressure.
C1 verb /ˌriːhəˈbɪlɪteɪt/

rehabilitate

Meaning
to restore someone to health, normal life, or a good condition after illness, injury, or imprisonment
Example
The clinic helps rehabilitate injured athletes.
C1 noun /pɔl/

Pall

Meaning
a cloth spread over a coffin; a dark covering that creates a gloomy atmosphere
Example
A pall of smoke hung over the burning building.
C1 noun /ˈhaɪ.nəs/

Highness

Meaning
a title given to a person of royal rank; the quality or state of being high or elevated
Example
Your Highness, the royal carriage is ready to take you to the state banquet this evening.
C1 noun /ˈlɛɡɪŋ/

legging

Meaning
tight-fitting stretch pants, typically worn by women for exercise or casual wear
Example
She bought a new pair of black leggings for the gym.
C1 noun /ˈhɜːrbɪsaɪd/

herbicide

Meaning
A chemical substance used to kill unwanted plants, especially weeds.
Example
Farmers used herbicide to protect their crops from invasive weeds.
C1 noun /əbˈzɜːrvətɔːri/

observatory

Meaning
A building equipped for observing astronomical or meteorological events.
Example
The observatory is open to the public on weekends.
C1 verb /flɔːnt/

flaunt

Meaning
to show off something proudly, often to attract attention
Example
She likes to flaunt her new jewelry at parties.
C1 noun/adjective /ˈmæm.əθ/

mammoth

Meaning
An extinct large elephant-like animal with long curved tusks; also means something huge.
Example
The company faced a mammoth challenge during expansion.
C1 verb /ɪnˈθrɔːl/

enthrall

Meaning
to captivate or hold someone’s attention completely
Example
The magician’s tricks enthralled the children.
C1 adjective /ədˈhiːsɪv/

Adhesive

Meaning
আঠালো; চটচটে;
Example
The adhesive tape stuck firmly to the wall.
C1 noun, verb /ˈɔːtɒpsi/

autopsy

Meaning
a post-mortem examination to discover the cause of death or the extent of disease
Example
The autopsy revealed that the victim had died from poisoning.
C1 noun /ˈsɒnɪt/

sonnet

Meaning
A poem of 14 lines using formal rhyme schemes, often about love.
Example
Shakespeare wrote many famous sonnets about love and beauty.
C1 noun /ˈtændʒənt/

tangent

Meaning
a straight line or plane that touches a curve or curved surface at a point but does not cross it
Example
The teacher drew a tangent to the circle on the board.
C1 noun /ˈɜːrθənˌwɛr/

earthenware

Meaning
pottery made of clay and hardened by heat
Example
The shop displayed beautiful earthenware pots and bowls.
C1 noun /ˈtæn.dəm/

Tandem

Meaning
a bicycle built for two riders, one behind the other
Example
The couple enjoyed riding their tandem bicycle through the park.
C1 noun, verb /ˈliːvər/ or /ˈlɛvər/

lever

Meaning
a rigid bar used to move or lift heavy objects; to move something using leverage.
Example
He used a lever to lift the heavy stone.
C1 verb /praɪ/

pry

Meaning
to look closely into something; to try to find out private information
Example
She tried to pry into her neighbor’s private life.
C1 noun /ˌtɛrəˈdæktɪl/

pterodactyl

Meaning
An extinct flying reptile of the Jurassic period, with a long slender head and wings formed by a membrane stretching along the body.
Example
The museum displayed a fossil of a giant pterodactyl.
C1 noun dɪˈspær.ə.ti

disparity

Meaning
A great difference or inequality.
Example
Disparity between countries must be reduced.
C1 adjective /ɪnˈdʒʊəriəs/

injurious

Meaning
Causing or likely to cause harm or damage.
Example
Smoking is injurious to health.
C1 verb /dʒəʊlt/

jolt

Meaning
to push or shake someone or something abruptly and roughly
Example
The sudden stop jolted all the passengers forward.
C1 noun /ˈbɔɪənsi/ or /ˈbuːjənsi/

buoyancy

Meaning
The ability to float in a liquid; cheerfulness and optimism.
Example
Her natural buoyancy lifted the mood of the group.
C1 noun /frɪˈvɒləti/

frivolity

Meaning
Lack of seriousness; silly or trivial behavior.
Example
The teacher discouraged frivolity during the exam.
C1 adjective /ˈpəʊ.tənt/

Potent

Meaning
having great strength, power, or effect; influential
Example
The medicine is very potent and should be taken carefully.
C1 noun /ˈbroʊkərɪdʒ/

brokerage

Meaning
A firm that acts as an intermediary between buyers and sellers, often charging a fee.
Example
The real estate brokerage helped them find a new home.
C1 verb /ˈmɜːrmər/

murmur

Meaning
To say something in a low, soft, or indistinct voice.
Example
She murmured a prayer before going to sleep.
C1 noun /ˈproʊbeɪt/

probate

Meaning
the official proving of a will in a court of law
Example
The family had to go through probate after his death.
C1 adjective /ˈnɒnʃələnt/

nonchalant

Meaning
Appearing calm, casual, and unconcerned.
Example
He gave a nonchalant shrug and walked away.
C1 adjective /ʌnˈduː/

Undue

Meaning
excessive; inappropriate; more than is necessary or proper
Example
The teacher complained about undue pressure from parents.
C1 noun/verb /ˈætrəfi/

atrophy

Meaning
a decrease in size or wasting away of a body part, tissue, or ability due to lack of use
Example
Without regular exercise, muscles may atrophy over time.
C1 verb /əˈpiːz/

appease

Meaning
to calm or pacify someone by meeting their demands
Example
The manager tried to appease the angry customer.
C1 verb /ˈkʌvət/

covet

Meaning
to desire something belonging to someone else
Example
He coveted his neighbor's new car.
C1 adjective /ˌɛɡzɪˈstɛnʃəl/

existential

Meaning
Relating to human existence, often concerning meaning or purpose of life.
Example
She went through an existential crisis during her midlife.
C1 verb /druːp/

droop

Meaning
to bend or hang downward; to become weak or tired
Example
The flowers began to droop in the heat.
C1 noun /doʊ/

doe

Meaning
a female deer, especially an adult one
Example
The doe and her fawn were grazing in the meadow.
C1 noun /ˌvɜːrtʃuˈoʊsoʊ/

virtuoso

Meaning
A person highly skilled in music, art, or another artistic pursuit.
Example
The pianist is a true virtuoso, captivating audiences worldwide.
C1 adjective /traɪt/

trite

Meaning
Overused and lacking originality.
Example
The speech was full of trite phrases.
C1 verb /ˈdʒɜːrmɪneɪt/

germinate

Meaning
To begin to grow or develop, especially referring to a seed.
Example
The seeds germinate quickly in moist soil.
C1 verb /pəˈruːz/

peruse

Meaning
to read something carefully and thoroughly; sometimes used to mean to browse casually
Example
She sat down to peruse the contract before signing it.
C1 noun /ˈpoʊlstər/

pollster

Meaning
a person or organization that conducts surveys to gauge public opinion
Example
The pollster predicted a close election outcome.
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 verb /ˈsenʃər/

censure

Meaning
to criticize severely; to express strong disapproval
Example
The committee censured the politician for his misconduct.
C1 noun /rɪˈvʌlʃən/

revulsion

Meaning
a strong feeling of disgust or repulsion
Example
She felt revulsion at the sight of the cruel act.
C1 adjective /ˌhaɪəˈrɑː.kɪ.kəl/

hierarchical

Meaning
arranged in order of rank or authority
Example
The company has a strict hierarchical structure.
C1 verb /ɪˈmænsɪpeɪt/

emancipate

Meaning
to set someone free from legal, social, or political restrictions; to liberate from slavery or oppression
Example
The law was designed to emancipate slaves and grant them full citizenship.
C1 adjective /ɪnˈdjʊər.ə.bəl/

Endurable

Meaning
able to be endured; bearable; tolerable
Example
The pain was endurable with proper medication.
C1 adjective /ˈfiːlaɪn/

feline

Meaning
relating to or characteristic of cats
Example
Her movements were graceful and almost feline in their elegance.
C1 adjective /rɪˈpɛlənt/

repellent

Meaning
Able to drive away something, especially insects or unpleasant things; causing disgust or distaste.
Example
This cream is highly effective as a mosquito repellent.
C1 noun /ɡræft/

Graft

Meaning
a shoot or twig inserted into a slit on the trunk of a living tree to form a new growth; corruption in politics or business
Example
The gardener used a graft to combine different varieties of apple trees.
C1 noun /ˈstæl.i.ən/

stallion

Meaning
An adult male horse that is not castrated, often used for breeding.
Example
The farm owns a powerful stallion for breeding purposes.
C1 noun /ˈrez.ɪ.dənt ˈkəʊ.ɔː.dɪ.neɪ.tər/

resident coordinator

Meaning
A local administrator or official who coordinates activities in a specific region.
Example
The resident coordinator welcomed all representatives.
C1 adjective /ˈpæl.ɪd/

Pallid

Meaning
pale, especially because of poor health; lacking substance or vitality
Example
His pallid complexion showed signs of illness.
C1 noun /ˌæktʃuˈæləti/

actuality

Meaning
The state of existing in reality rather than in appearance or imagination.
Example
The movie was based on historical actuality.
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 verb /dɪsˈpruːv/

disprove

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

aridity

Meaning
The state of being extremely dry, especially having insufficient rainfall to support vegetation.
Example
The aridity of the land is increasing due to climate change.
C1 adjective /ˌɒbsəˈliːt/

obsolete

Meaning
No longer in use or out of date.
Example
Floppy disks are now completely obsolete.
C1 noun /ˈmæk.rəʊˌnjuː.tri.ənts/

macronutrients

Meaning
Nutrients that are needed in large amounts to provide energy and building materials for the body, including carbohydrates, proteins, and fats.
Example
Proteins, fats, and carbohydrates are vital macronutrients.
C1 noun /ˌstætɪˈstɪʃən/

statistician

Meaning
A person who specializes in collecting, analyzing, and interpreting numerical data.
Example
The statistician presented the survey results with great clarity.
C1 verb /ˌdɪskənˈsɜːrt/

disconcert

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

wiry

Meaning
Lean, tough, and strong, often with sinewy muscles.
Example
The wiry athlete moved with remarkable speed and agility.
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 /ˌdʒuː.bɪˈleɪ.ʃən/

jubilation

Meaning
a feeling or expression of great happiness and triumph
Example
There was jubilation in the streets after the victory.
C1 adjective /ɪˈluːsɪv/

elusive

Meaning
Difficult to find, catch, or achieve; hard to understand or define.
Example
The solution to the problem proved elusive.
C1 adjective ɪmˈpɪr.ɪ.kəl

empirical

Meaning
Based on, concerned with, or verifiable by observation or experience rather than theory or pure logic.
Example
Scientific research relies on empirical evidence.
C1 adjective /ˌʌnəbˈtruːsɪv/

unobtrusive

Meaning
not attracting attention; blending in without causing notice
Example
The security cameras are designed to be unobtrusive.
C1 noun /ɡrəˈfiː.ti/

Graffiti

Meaning
writing or drawings scribbled, scratched, or sprayed illicitly on a wall or other surface in a public place
Example
The subway walls were covered with colorful graffiti created by local street artists.
C1 noun /poʊˈlær.ɪ.ti/

polarity

Meaning
the state of having two opposite or contradictory tendencies, opinions, or aspects
Example
The polarity between the two political parties is growing stronger.
C1 verb /ˈstaɪmi/

stymie

Meaning
to prevent or hinder the progress of something
Example
The new regulations could stymie small businesses.
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 /rɪˈmjuːnəreɪt/

remunerate

Meaning
To pay someone for services or work done.
Example
The company will remunerate employees fairly for their overtime.
C1 noun /ˈpɛnənt/

pennant

Meaning
A tapering flag used for signaling or as an emblem of victory or achievement.
Example
The team raised the championship pennant proudly.
C1 adjective /səbˈsɜːviənt/

subservient

Meaning
prepared to obey others unquestioningly; less important than something else
Example
She was too subservient to challenge his decision.
C1 adjective /ˌrɛtroʊˈæktɪv/

retroactive

Meaning
applying to a period before it was enacted or established
Example
The new law was made retroactive to cover past cases.
C1 adjective /ɪnˈfæləbl̩/

infallible

Meaning
incapable of making mistakes or being wrong
Example
Her judgment seemed infallible in matters of finance.
C1 adjective rɪsk-ədˈʤɛstɪd

risk-adjusted

Meaning
Modified or calibrated to account for risk factors in investment returns.
Example
Risk-adjusted returns consider both potential profit and loss.
C1 noun /ˈlɛktən/

lectern

Meaning
A tall stand with a sloping top used to support a book, notes, or script during a speech or lecture.
Example
The professor placed her notes on the lectern before starting her lecture.
C1 noun /ˈvɜːrtɛks/

vertex

Meaning
The highest point; the top or the apex.
Example
The climber reached the vertex of the mountain.