revolutionary breakthrough
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C1 noun /ˌrev.əˈluː.ʃən.ər.i ˈbreɪk.θruː/

revolutionary breakthrough

Meaning
A sudden, dramatic, and important discovery or development that changes everything.
Example
Robotic surgery is a revolutionary breakthrough in healthcare.
C1 noun /ˌɪnkəmˌpætəˈbɪlɪti/

incompatibility

Meaning
the state of being unable to exist or work together harmoniously; lack of compatibility
Example
The project failed because of incompatibility between the two software systems.
C1 noun /ˈwɪndfɔːl/

windfall

Meaning
an unexpected piece of good fortune, typically a large amount of money
Example
The startup received a windfall when a major client paid for a full year in advance.
C1 noun/adjective /dɪˈtɜː.rənt/

deterrent

Meaning
A thing that discourages or is intended to discourage someone from doing something.
Example
A strict law serves as a deterrent to crime.
C1 verb /ˈmæɡnɪfaɪ/

magnify

Meaning
to make something appear larger; to increase the importance or effect of something
Example
The microscope can magnify tiny objects for better observation.
C1 adjective /ˈskɛtʃi/

sketchy

Meaning
not thorough or detailed; suspicious or unsafe
Example
The details of the project were still sketchy.
C1 verb /ˈfɔːltər/

falter

Meaning
to hesitate or lose strength or momentum
Example
Her voice faltered as she delivered the speech.
C1 adjective /ˌpɛd.əˈɡɒdʒ.ɪ.kəl/

pedagogical

Meaning
Relating to teaching and education; concerned with the methods and practice of teaching.
Example
The school adopted new pedagogical techniques to improve learning.
C1 verb /ˌoʊvərˈrʌn/

overrun

Meaning
to spread over or occupy completely; to exceed a limit or time
Example
The garden was overrun with weeds.
C1 adjective /ˈmɑːr.dʒɪ.nəl/

Marginal

Meaning
relating to or situated at the edge; minimal; slight
Example
The marginal improvement in sales was barely noticeable.
C1 noun ɔːˈstɛr.ɪ.ti

austerity

Meaning
Simple and disciplined lifestyle, avoiding luxury.
Example
The government implemented austerity measures to reduce expenses.
C1 verb, noun /lɜːrtʃ/

lurch

Meaning
to make an abrupt, unsteady, or uncontrolled movement; a sudden movement or stagger
Example
The bus lurched forward as the driver hit the brakes.
C1 noun /ˈhʌbʌb/

hubbub

Meaning
a loud noise caused by a crowd of people talking or shouting
Example
There was a hubbub in the market as the sale began.
C1 adjective /ˌʌndərˈsteɪtɪd/

understated

Meaning
Presented in a subtle and restrained way.
Example
She wore an elegant but understated dress.
C1 adjective /ɪmˈpʌlsɪv/

impulsive

Meaning
acting suddenly without careful thought
Example
She made an impulsive decision to buy the car.
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 noun /kənˈtʃɛrtoʊ/

concerto

Meaning
a musical composition for one or more solo instruments accompanied by an orchestra
Example
She played a Mozart concerto with the orchestra.
C1 adjective /ˈspʌndʒi/

Spongy

Meaning
soft and full of holes like a sponge; porous
Example
The cake had a light and spongy texture.
C1 noun, adjective /ˈlæksətɪv/

laxative

Meaning
A medicine or substance that stimulates bowel movements; tending to loosen or relieve constipation.
Example
The doctor prescribed a mild laxative for her condition.
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 /ˌkɒnfɪˈdɑːnt/

confidante

Meaning
A woman with whom one shares a secret or private matter, trusting her not to repeat it.
Example
The queen’s maid became her most trusted confidante.
C1 noun /sloʊθ/

Sloth

Meaning
laziness; reluctance to work or make an effort
Example
His sloth prevented him from achieving his goals.
C1 adjective /rɪˈsɜːrdʒənt/

resurgent

Meaning
Becoming strong, active, or popular again.
Example
The resurgent economy gave hope to many businesses.
C1 noun /ˈtɪt.bɪt/

Titbit

Meaning
a small piece of tasty food; a small interesting piece of information
Example
She served delicious titbits at the party.
C1 noun /ˈsʌn.stroʊk/

Sunstroke

Meaning
a serious condition caused by overheating from prolonged exposure to high temperatures
Example
The worker suffered from sunstroke after working outside all day.
C1 noun ɪnˈdɪdʒɪnəs trəˈdɪʃənz

Indigenous Traditions

Meaning
Cultural practices, beliefs, and customs that have been passed down through generations among native peoples.
Example
Indigenous traditions in the Chittagong Hill Tracts are unique.
C1 adjective /ʌnˈsɜːrvɪsəbəl/

Unserviceable

Meaning
not in working order; unable to be used; defective
Example
The old computer became unserviceable after the system crash.
C1 adjective /ˈpoʊləraɪzd/

polarized

Meaning
divided into two sharply contrasting groups or opinions
Example
The debate polarized the community on the issue of climate change.
C1 adjective /ˈkɔː.stɪk/

caustic

Meaning
able to burn or corrode by chemical action; severely sarcastic
Example
Her caustic remarks hurt his feelings.
C1 noun/verb /ɡrʌdʒ/

grudge

Meaning
A persistent feeling of ill will or resentment from a past insult or injury.
Example
She still holds a grudge against him for what happened years ago.
C1 noun /ˈaʊtriːtʃ/

outreach

Meaning
The act of providing services or support to people who might not otherwise have access to them.
Example
The charity launched a new outreach program for the homeless.
C1 verb /fɔːrˈʃædoʊ/

foreshadow

Meaning
To indicate or suggest something that will happen in the future
Example
Dark clouds foreshadowed an approaching storm.
C1 noun /ˈprɒfəsi/

prophecy

Meaning
a prediction or message about the future, often believed to be divinely inspired
Example
The prophecy foretold the rise of a great leader.
C1 noun ˈhʌz.bən.dri

husbandry

Meaning
The care, cultivation, and breeding of crops and animals; farming and agriculture.
Example
Proper husbandry techniques improve livestock health.
C1 noun /ˈmeɪhɛm/

mayhem

Meaning
Violent or extreme disorder; chaos and destruction.
Example
The protest turned into mayhem when the crowd clashed with the police.
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 noun /ˈhaɪndsaɪt/

hindsight

Meaning
Understanding of a situation only after it has happened.
Example
With the benefit of hindsight, we realized the decision was a mistake.
C1 verb /prɒd/

prod

Meaning
to poke or push someone or something with a finger, foot, or pointed object
Example
She prodded him in the arm to get his attention.
C1 adjective /ˈpær.ə.nɔɪd/

paranoid

Meaning
having an unreasonable fear or suspicion of others
Example
She became paranoid after hearing strange noises outside.
C1 adjective /ˈstɪltɪd/

stilted

Meaning
Speech or writing that is stiff, unnatural, or overly formal.
Example
His speech sounded stilted and rehearsed.
C1 noun /ˌpænəˈsiːə/

panacea

Meaning
A solution or remedy for all difficulties or diseases.
Example
Education is often seen as a panacea for social problems.
C1 adjective /ˌʌnrɪˈkwaɪtɪd/

unrequited

Meaning
Not returned or reciprocated, especially in the context of love or affection.
Example
He suffered from unrequited love for years.
C1 verb /mɪns/

mince

Meaning
to cut into very small pieces; to walk with short quick steps
Example
She minced the garlic for the recipe.
C1 adjective /ˈræb.ɪd/

rabid

Meaning
Having extreme or fanatical support for something; relating to or suffering from rabies.
Example
He was a rabid fan of the football team.
C1 verb /riːˈfɜːrbɪʃ/

refurbish

Meaning
To renovate or redecorate something, especially a building.
Example
The company decided to refurbish its old office.
C1 noun ˌdʒiːəˈlɒdʒɪkəl ˈstrʌktʃər

geological structure

Meaning
The arrangement and composition of rocks, minerals, and landforms in the Earth's crust.
Example
Scientists will study the Moon's geological structure.
C1 verb /sɪft/

sift

Meaning
to separate or sort through carefully, often using a sieve or by examining closely
Example
She sifted the flour before adding it to the cake mixture.
C1 noun /mɒnˈtɑːʒ/

montage

Meaning
A sequence of film editing or a composite image made by combining several separate pictures.
Example
The film opened with a montage of city life.
C1 noun ˌɪn.ɪˈfɪʃ.ən.si

inefficiency

Meaning
The state or quality of not achieving maximum productivity; failure to make the best use of time or resources.
Example
Government inefficiency leads to slow project completion.
C1 verb /ˈtɛðər/

tether

Meaning
To tie an animal with a rope or chain so it cannot move far.
Example
The farmer tethered the goat to a post.
C1 verb /ˈkænvəs/

canvass

Meaning
to solicit votes or opinions; to examine thoroughly; to discuss in detail
Example
They will canvass the neighborhood for votes.
C1 noun /ɪnˈædɪkwəsi/

inadequacy

Meaning
lack of sufficient ability, quality, or strength; a feeling of not being good enough
Example
She struggled with feelings of inadequacy at work despite her strong qualifications.
C1 noun /ˈbænɪstər/

banister

Meaning
a railing supported by posts at the side of a staircase or balcony
Example
She held the banister tightly while going down the stairs.
C1 adjective /ˈpɒp.jʊ.ləs/

Populous

Meaning
having a large population; densely populated; crowded with people
Example
China is the most populous country in the world.
C1 noun /rɪˈflɛktər/

reflector

Meaning
A surface or device that reflects light, heat, or sound, often used to direct beams or improve visibility.
Example
The cyclist attached a red reflector to the back of his bike for safety.
C1 noun /ɪnˈhɛrɪtər/

inheritor

Meaning
a person who receives money, property, or a title when someone dies
Example
She became the inheritor of her family's estate.
C1 noun /ˈɡæloʊz/

gallows

Meaning
A structure used for hanging criminals who have been sentenced to death.
Example
The criminal was led to the gallows at dawn.
C1 noun /braɪn/

brine

Meaning
Water saturated with salt, often used for preserving food.
Example
The olives were stored in brine to keep them fresh.
C1 noun /ʃruː/

shrew

Meaning
a small mouse-like animal; also a woman with a bad temper
Example
The play describes a strong-willed woman as a shrew.
C1 adjective /ˈsɒnɪk/

sonic

Meaning
Relating to or involving sound waves or speed of sound.
Example
The jet created a loud boom when it broke the sonic barrier.
C1 adjective /steɪd/

staid

Meaning
Serious, respectable, and unadventurous.
Example
He came from a staid family background.
C1 verb /ˈlaɪ.kən/

liken

Meaning
to compare one thing to another, often in a figurative way
Example
He likened her voice to sweet music.
C1 noun /ˈdɪs.ə.nəns/

dissonance

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

Superbly

Meaning
in an excellent or outstanding manner
Example
She performed superbly in the dance competition.
C1 verb /ˈaɪdəlaɪz/

idolize

Meaning
To admire or worship someone excessively.
Example
Fans often idolize celebrities for their talent and lifestyle.
C1 verb, noun /ɡɔːrdʒ/

gorge

Meaning
to eat greedily; a narrow valley between mountains or hills
Example
They gorged themselves on pizza after the hike.
C1 adjective /ˈkɒɡ.nɪ.zənt/

cognizant

Meaning
Having knowledge or being aware of something.
Example
He was cognizant of the risks before starting the project.
C1 verb /ˈdɛsɪmeɪt/

decimate

Meaning
To destroy or kill a large proportion of something.
Example
The wildfire decimated the forest.
C1 verb /lʌl/

lull

Meaning
to soothe or calm; to cause to sleep or rest
Example
The gentle music lulled the baby to sleep.
C1 verb /tʃæsˈtaɪz/

chastise

Meaning
to criticize or punish severely
Example
The teacher chastised the student for being late.
C1 adjective /sɪˈkluːdɪd/

secluded

Meaning
Placed apart from other people or things; private and quiet.
Example
They spent their vacation in a secluded beach house.
C1 noun /prɪˈtɛnʃən/

pretension

Meaning
A claim or assertion to something, often without justification; an attempt to impress by showing greater importance or talent than is actually possessed.
Example
His pretension to be an expert was quickly exposed.
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 /ˈɪntərˌluːd/

interlude

Meaning
A short period of time that comes between two events; an interval.
Example
There was a brief musical interlude between the two acts of the play.
C1 noun /səˈbætɪkəl/

sabbatical

Meaning
A period of paid leave granted to a teacher or worker for study or travel, traditionally every seventh year.
Example
She took a sabbatical to research her new book.
C1 noun /ˌprɒvəˈkeɪʃən/

provocation

Meaning
An action or statement that is intended to make someone angry or to cause a reaction.
Example
His rude comment was a clear provocation.
C1 noun /kɑst/

Caste

Meaning
a social class system; a hereditary class of Hindu society
Example
The ancient caste system divided society into different social groups.
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 /prɪˈtɛnʃəs/

pretentious

Meaning
Attempting to impress by affecting greater importance, talent, culture, etc., than is actually possessed.
Example
The restaurant was stylish but far too pretentious for my taste.
C1 adjective /əˈblaɪdʒɪŋ/

obliging

Meaning
Willing to help or do favors; accommodating.
Example
The staff at the hotel were very obliging and friendly.
C1 adjective /ɪnˈɛlɪdʒəbəl/

Ineligible

Meaning
not qualified or entitled to participate or be chosen; unsuitable
Example
Students with poor grades are ineligible for the scholarship program.
C1 verb /ˈkɒnsɪkreɪt/

consecrate

Meaning
to make something sacred, usually through a religious ceremony
Example
The church was consecrated by the bishop.
C1 verb /ɔːrˈdeɪn/

ordain

Meaning
To officially make someone a priest or minister; to decree or order something officially.
Example
The bishop will ordain three new priests this Sunday.
C1 noun /ɪnˈfjuːʒən/

infusion

Meaning
the act of introducing something into another; a drink made by steeping leaves or herbs in liquid
Example
She prepared a calming infusion of chamomile tea.
C1 adjective /ˈdeɪnti/

dainty

Meaning
Delicately small, pretty, and often considered elegant.
Example
She wore a dainty necklace made of pearls.
C1 noun /ˈɑːr.tər.i/

Artery

Meaning
a blood vessel that carries blood away from the heart to other parts of the body
Example
The doctor checked the pulse in his artery.
C1 noun /ˌsɛrənˈdɪpɪti/

serendipity

Meaning
The occurrence of events by chance in a happy or beneficial way.
Example
Finding that old photo album was pure serendipity.
C1 verb /bɪˈstoʊ/

bestow

Meaning
To give or present something as a gift or honor.
Example
The king bestowed honors upon the brave soldiers.
C1 verb /skʌlpt/

sculpt

Meaning
to create or shape something by carving or molding
Example
The artist sculpted a beautiful statue from marble.
C1 verb məˈnɒp.ə.laɪz

monopolize

Meaning
Control exclusively, dominate market.
Example
The company tried to monopolize the market.
C1 adjective /həˈbɪtʃuəl/

habitual

Meaning
Done or doing constantly or as a habit; customary.
Example
He was a habitual latecomer to class.
C1 noun /sʌˈmeɪʃən/

summation

Meaning
The process of adding things together; a summary of points.
Example
The lawyer gave a powerful summation of the case.
C1 noun /əˈlʌmnəs/

alumnus

Meaning
a former student or graduate of a school, college, or university
Example
He is an alumnus of Harvard University.
C1 verb /pərˈtɜːrb/

perturb

Meaning
To disturb or unsettle greatly in mind.
Example
The sudden noise perturbed the students during the exam.
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 noun /ˈmɪd.waɪf/

midwife

Meaning
A person, typically a woman, trained to assist women during childbirth.
Example
The midwife stayed with the mother throughout her labor.
C1 verb /ɪnˈʃraɪn/

enshrine

Meaning
to preserve or cherish something as sacred or important
Example
The constitution enshrines the right to freedom of speech.
C1 noun /ˈdaɪhɑːrd/

diehard

Meaning
A person who strongly resists change and remains loyal to a belief or cause.
Example
He is a diehard fan of classic rock music.
C1 adjective /ˌzɛnəˈfoʊbɪk/

xenophobic

Meaning
having or showing a dislike or fear of people from other countries
Example
The leader’s xenophobic comments sparked outrage across the country.
C1 adjective, noun /ɔːɡˈzɪliəri/

auxiliary

Meaning
(adjective) providing supplementary or additional help and support; (noun) a person or thing that provides auxiliary support
Example
The hospital has an auxiliary power generator in case of emergencies.
C1 noun /ɛnˈdɔːr.fɪnz/

endorphins

Meaning
Chemical compounds produced by the brain that reduce pain and create feelings of happiness.
Example
Exercise releases endorphins, reducing stress and pain.
C1 verb ˌæs.ɚˈteɪn

ascertain

Meaning
To find out or discover something with certainty; to verify.
Example
The police tried to ascertain the cause of the accident.
C1 adjective rɪˈsɛʃ.ən.er.i

recessionary

Meaning
Relating to or characterized by economic recession.
Example
Governments introduce policies to counter recessionary effects.
C1 noun /ˈlɪrɪk/

lyric

Meaning
the words of a song or a short poem that expresses personal feelings
Example
She memorized every lyric of her favorite song.
C1 adjective /ˈskeɪðɪŋ/

scathing

Meaning
severely critical; harshly scornful
Example
The critic wrote a scathing review of the movie.
C1 noun /ˈfɛlən/

felon

Meaning
a person who has committed a serious crime
Example
The felon was sentenced to ten years in prison.
C1 verb /ɪnˈfleɪt/

inflate

Meaning
to fill with air or gas so it expands; to increase excessively or artificially
Example
The mechanic inflated the tire to the correct pressure.
C1 noun /ˈpoʊdiətrɪst/

podiatrist

Meaning
a doctor specializing in foot care
Example
I have an appointment with the podiatrist for my ankle pain.
C1 noun ˌwɛðəraɪˈzeɪʃən

weatherization

Meaning
The practice of protecting a building and its interior from the elements.
Example
The house underwent weatherization to improve energy efficiency.
C1 adjective /ˈlɔː.də.bəl/

laudable

Meaning
Deserving praise and admiration.
Example
Her efforts to help the poor are truly laudable.
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 /ˈkɒn.vɔɪ/

convoy

Meaning
a group of vehicles or ships traveling together, often for protection
Example
The military convoy moved through the desert at dawn.
C1 noun /ˌdʒiːniˈælədʒi/

genealogy

Meaning
The study and tracing of lines of descent or family history.
Example
She spent years researching her family's genealogy.
C1 noun /ˈtrɪkstər/

trickster

Meaning
A person who cheats or deceives people.
Example
The old man turned out to be a clever trickster who fooled everyone.
C1 noun /bəˈnæn.zə/

Bonanza

Meaning
a situation or event that creates a sudden increase in wealth, good fortune, or profits
Example
The oil discovery was a bonanza for the small country.
C1 verb /ʌnˈɜːθ/

unearth

Meaning
To dig up from the ground or to discover something hidden.
Example
Archaeologists unearthed ancient artifacts at the site.
C1 noun pɔɪz

poise

Meaning
Natural confidence and composure maintained under pressure.
Example
A good speaker maintains poise under pressure.
C1 noun dʒəˈnɛt.ɪk ˌmɒd.ɪ.fɪˈkeɪ.ʃən

genetic modification

Meaning
The process of altering the genetic code of plants or animals.
Example
Genetic modification enhances crop resistance to pests and diseases.
C1 noun /ˈbɑn.dɪdʒ/

Bondage

Meaning
the state of being a slave; the state of being under the control of a force or influence
Example
The people fought to escape from the bondage of oppression.
C1 noun /dɜːrθ/

dearth

Meaning
A scarcity or lack of something.
Example
There was a dearth of food during the famine.
C1 phrase ˌbaɪ.oʊ.daɪˈvɜː.sɪ.ti ˌprez.əˈveɪ.ʃən

biodiversity preservation

Meaning
The protection and conservation of the variety of life in all its forms, including different species, genetic diversity, and ecosystems.
Example
Biodiversity preservation is critical for ecological balance.