circadian rhythm
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C1 noun sɜːrˈkeɪdiən ˈrɪðəm

circadian rhythm

Meaning
The body's natural sleep-wake cycle that occurs within 24 hours
Example
Exposure to natural light regulates the circadian rhythm.
C1 adjective /ˈsɜːrvɪsəbl/

serviceable

Meaning
fit for use; usable; in working order
Example
The old bicycle is still serviceable despite its age.
C1 verb /ɪˈroʊd/

erode

Meaning
to gradually wear away or destroy by natural forces such as water, wind, or chemical action
Example
The coastline has begun to erode due to constant waves.
C1 verb /tʃæsˈtaɪz/

chastise

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

percolator

Meaning
A device used for brewing coffee by continually cycling boiling water through coffee grounds.
Example
She made a fresh pot of coffee using the percolator.
C1 noun /ˈɛstjʊəri/

estuary

Meaning
the tidal mouth of a large river, where the tide meets the stream
Example
The city is located near the estuary of the river.
C1 noun /nuːs/

Noose

Meaning
a loop with a running knot used for hanging; a trap or snare
Example
The cowboy made a noose to catch the wild horse.
C1 verb /ɪnˈfjʊərieɪt/

infuriate

Meaning
To make someone extremely angry.
Example
His careless remarks infuriated the entire team.
C1 adjective ˈɒk.sɪ.də.tɪv

oxidative

Meaning
Related to or caused by oxidation, especially cellular damage from free radicals.
Example
Excess stress can lead to oxidative damage in cells.
C1 verb /blæntʃ/

blanch

Meaning
to turn pale from shock, fear, or to briefly boil food to remove skin or prepare it
Example
She blanched at the sight of blood.
C1 adjective /ˈlɔː.də.bəl/

laudable

Meaning
Deserving praise and admiration.
Example
Her efforts to help the poor are truly laudable.
C1 verb /riːk/

wreak

Meaning
to cause or inflict something, especially damage or harm
Example
The storm wreaked havoc on the coastal villages.
C1 adjective /ˈkrɛdɪtəbl/

creditable

Meaning
Deserving praise or acknowledgment, though not necessarily outstanding.
Example
She made a creditable effort in completing the project on time.
C1 noun /sɪˈdʌk.ʃən/

Seduction

Meaning
the action of seducing someone; temptation to do something wrong
Example
He fell victim to the seduction of easy money.
C1 noun ˌsæn.ɪ.taɪˈzeɪ.ʃən

sanitization

Meaning
The process of cleaning and disinfecting to eliminate germs and bacteria.
Example
Regular sanitization keeps appliances germ-free.
C1 adjective /ræpt/

Rapt

Meaning
completely fascinated or absorbed by what one is seeing or hearing
Example
The children listened with rapt attention to the storyteller.
C1 verb /ˈɒfsɛt/

offset

Meaning
To counterbalance or compensate for something.
Example
The company's losses were offset by gains in other departments.
C1 verb /ˌpoʊstˈdeɪt/

postdate

Meaning
To assign a date later than the actual date to a document or event.
Example
She postdated the check to next month.
C1 noun /ˈɪn.floʊ/

inflow

Meaning
The movement of things such as money, people, or water into a place.
Example
The inflow of tourists boosted the local economy.
C1 noun /ˈfɔːrsəm/

foursome

Meaning
a group of four people or things, especially in games or social activities
Example
The foursome enjoyed a game of golf together.
C1 adjective /ˈmaɪndləs/

mindless

Meaning
without thought or intelligence; done without consideration
Example
He was bored by the mindless tasks at work.
C1 adjective ˈkwɒn.tɪ.faɪ.ə.bəl

quantifiable

Meaning
Able to be expressed or measured as a quantity; capable of being counted or calculated.
Example
The impact of the project is quantifiable.
C1 noun /ˈbuːt.stræp.ɪŋ/

bootstrapping

Meaning
Starting a business with personal resources or small investments without external funding or venture capital.
Example
Many entrepreneurs rely on bootstrapping to launch their businesses.
C1 noun /deɪˈbɑː.kəl/

debacle

Meaning
A sudden and ignominious failure; a fiasco.
Example
The company's poor management led to a financial debacle.
C1 adjective /ˈsʌbstəntɪv/

substantive

Meaning
Having a firm basis in reality; important, meaningful, or considerable.
Example
The company made substantive changes to its policy.
C1 noun /ˌmɪsdɪˈmiːnər/

misdemeanor

Meaning
A minor wrongdoing or criminal offense that is less serious than a felony.
Example
He was fined for a misdemeanor involving public disturbance.
C1 verb /ɪmˈpɛər/

impair

Meaning
to weaken or damage something, especially a function or ability
Example
Smoking can impair your lung capacity.
C1 adjective /ˈfræɡməntɪd/

fragmented

Meaning
Having been broken into fragments; disjointed or incomplete.
Example
The information was fragmented and difficult to understand.
C1 verb /dɪsˈfɪɡjər/

disfigure

Meaning
to spoil or damage the appearance of something
Example
The fire disfigured the old building.
C1 adjective /ˈspeɪʃəl/

spatial

Meaning
relating to space or the position, area, and size of things
Example
The scientist studied the spatial arrangement of stars.
C1 noun /ænˈtɪθəsɪs/

antithesis

Meaning
A person, thing, or idea that is the direct opposite of another; a rhetorical device contrasting opposing ideas in parallel structure.
Example
Love is the antithesis of hate.
C1 adjective /ˌsɛrənˈdɪpɪtəs/

serendipitous

Meaning
Occurring or discovered by chance in a happy or beneficial way.
Example
Their meeting at the café was purely serendipitous.
C1 verb /əˈskraɪb/

ascribe

Meaning
To attribute something to a cause, source, or person.
Example
Many scholars ascribe the poem to an unknown author.
C1 verb /ˌoʊvərˈriːtʃ/

overreach

Meaning
to go beyond what is proper, acceptable, or achievable; to overextend
Example
The politician overreached by making promises he couldn't keep.
C1 noun /ˈkoʊhɔːrt/

cohort

Meaning
A group of people with a shared characteristic, usually of the same age or with a common experience.
Example
The study tracked a cohort of students over ten years.
C1 noun /ˈtraɪ.pɒd/

tripod

Meaning
A three-legged stand used to support a camera, telescope, or other object.
Example
The photographer set up his camera on a tripod.
C1 noun /ˈdeɪˌbreɪk/

daybreak

Meaning
The time in the morning when daylight first appears; dawn.
Example
They set out on their journey at daybreak.
C1 adjective /ˌʌnəˈteɪnəbl/

unattainable

Meaning
impossible to achieve, reach, or accomplish
Example
For many, becoming a professional athlete remains an unattainable dream.
C1 adverb/noun /ˌhɪərˈæftər/

hereafter

Meaning
from now on; in the future; also refers to life after death.
Example
Hereafter, all reports must be submitted electronically.
C1 noun ziːl

zeal

Meaning
Great energy or enthusiasm in pursuit of a cause or objective; passion.
Example
She approached the project with great zeal and determination.
C1 verb /ˈpɛdəl/

peddle

Meaning
To sell goods, often by going from place to place; sometimes used negatively to mean promoting an idea or product in a pushy way.
Example
Street vendors peddle handmade jewelry to tourists.
C1 noun ˈmaɪ.krəʊˌnjuː.tri.ənt

micronutrient

Meaning
Essential nutrients required by the body in small amounts, including vitamins and minerals.
Example
Iron and zinc are essential micronutrients for growth.
C1 noun dʒuːˈdɪʃ.ər.i

judiciary

Meaning
The judicial authorities of a country; the system of courts that interprets and applies the law.
Example
The judiciary ensures the rule of law.
C1 noun /wʊd ˈæp.əl/

Wood Apple

Meaning
a hard-shelled tropical fruit with aromatic pulp used in beverages and medicine
Example
The wood apple has a hard shell but sweet pulp inside.
C1 noun /ˌjuːθəˈneɪʒə/

euthanasia

Meaning
The practice of intentionally ending a life to relieve pain and suffering.
Example
The debate about euthanasia raises difficult ethical questions.
C1 noun /næk/

knack

Meaning
a natural skill or ability; a special talent for doing something easily
Example
She has a knack for making people feel comfortable.
C1 adjective ˌmɒn.jʊˈmɛn.təl

monumental

Meaning
Great in importance, extent, or size; exceptionally great; forming or serving as a monument.
Example
The discovery of electricity was a monumental achievement.
C1 adjective /kəmˈplaɪənt/

compliant

Meaning
Willing to agree with or follow rules, requests, or demands.
Example
She was compliant with all the safety requirements.
C1 noun /ˈdeɪtəm/ or /ˈdætəm/

datum

Meaning
a single piece of information; a fact used as a basis for reasoning or calculation
Example
Each datum in the survey was carefully analyzed.
C1 noun /ˈhɒl.ə.kɔːst/

holocaust

Meaning
A large-scale destruction, especially by fire; historically, the genocide of Jews during World War II.
Example
Millions of people perished during the Holocaust.
C1 verb /ɡʌʃ/

gush

Meaning
to flow out suddenly and forcefully, or to express something enthusiastically
Example
Tears began to gush from her eyes.
C1 adjective /ˈbaɪtɪŋ/

Biting

Meaning
extremely cold; sharply critical or harsh
Example
The biting cold made everyone shiver.
C1 noun /ˌrɛtrɪˈbjuːʃən/

retribution

Meaning
punishment inflicted as vengeance for a wrong or crime
Example
The villagers demanded retribution for the crime committed.
C1 noun /brʌnt/

brunt

Meaning
the worst part or main impact of something unpleasant
Example
The small town bore the brunt of the storm.
C1 noun/verb /rɪˈpoʊz/

repose

Meaning
a state of rest, sleep, or tranquility; to rest or lie in a peaceful position
Example
After the long journey, she sought repose in the quiet garden.
C1 adjective /ˈspel.baʊnd/

Spellbound

Meaning
completely fascinated and unable to move or think about anything else; enchanted
Example
The children sat spellbound as the magician performed his tricks.
C1 adjective /ɪˈlʌstriəs/

illustrious

Meaning
Well known, respected, and admired for past achievements.
Example
She had an illustrious career in medicine.
C1 adjective /əˈprɛs.ɪv/

Oppressive

Meaning
Harsh and authoritarian; overwhelming; causing distress; tyrannical;
Example
The oppressive heat made it difficult to work outside during the summer.
C1 noun /nɒb/

Knob

Meaning
a rounded handle on a door or drawer; a small rounded switch on a machine
Example
He turned the brass knob to open the old wooden door.
C1 adjective /ˈten.tə.tɪv/

Tentative

Meaning
not certain or fixed; provisional; hesitant or unsure
Example
We made tentative plans to meet next week.
C1 verb /ɪmˈpɒvərɪʃ/

impoverish

Meaning
To make someone poor or reduce the quality or richness of something.
Example
The long war impoverished the entire nation.
C1 noun /krʌˈsteɪʃən/

crustacean

Meaning
an aquatic animal with a hard shell, such as crabs, lobsters, and shrimps
Example
Crabs and lobsters are well-known crustaceans.
C1 verb /ɪnˈstɪl/

instill

Meaning
to gradually but firmly establish an idea, attitude, or habit in someone's mind
Example
Parents try to instill good values in their children.
C1 noun /ˈkɒz.moʊs/

Cosmos

Meaning
a colorful annual flower with daisy-like blooms and feathery foliage
Example
The cosmos flowers swayed gently in the summer breeze across the meadow.
C1 adverb /əˈraɪ/

awry

Meaning
away from the expected or proper direction; wrong or amiss
Example
The plan went awry when the weather suddenly changed.
C1 noun /ˈwɒndərlʌst/

wanderlust

Meaning
A strong desire to travel and explore the world.
Example
Her wanderlust took her to every corner of the globe.
C1 adjective /ˈtɪərfəl/

Tearful

Meaning
expressing or showing sadness and sorrow; inclined to weep
Example
She gave a tearful goodbye to her friends at the airport.
C1 noun /krʌst/

crust

Meaning
the hard outer surface of something, especially bread or the Earth's outer layer
Example
He cut off the crust of the bread before eating.
C1 noun ˈɛksəʊˌplænɪt

exoplanet

Meaning
A planet that orbits a star outside the solar system.
Example
Astronomers have discovered thousands of exoplanets in the last decade.
C1 noun /ˈhɔː.kər/

Hawker

Meaning
a person who travels about selling goods, typically from door to door or on the street
Example
The hawker sold fresh fruits from his cart.
C1 noun /ˌæntɪˈsiːdənts/

antecedents

Meaning
previous events, conditions, or people that influence or serve as a basis for something that follows
Example
The lawyer examined the criminal antecedents of the suspect.
C1 verb /dɪsˈɡrʌntl/

disgruntle

Meaning
to make someone dissatisfied or discontented
Example
The unfair treatment disgruntled the workers.
C1 noun /ˈkeɪ.sɪŋ/

Casing

Meaning
a cover or shell that protects or encloses something
Example
The mechanic removed the engine casing to examine the internal parts.
C1 adjective /pəˈleɪ.ʃəl/

palatial

Meaning
resembling a palace in being spacious and splendid
Example
They stayed in a palatial hotel during their vacation.
C1 noun /ˌɑːk.sɪˈmɔːr.ɒn/

oxymoron

Meaning
a figure of speech where two contradictory terms are combined
Example
The phrase 'deafening silence' is a classic oxymoron.
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 noun /ˈlaɪbəl/

libel

Meaning
a published false statement that damages a person's reputation
Example
The newspaper was sued for libel after publishing false claims.
C1 verb /ɪmˈpɛl/

impel

Meaning
to drive, force, or urge someone to do something
Example
Her curiosity impelled her to open the mysterious box.
C1 verb /dɪsˈkwɑːlɪfaɪ/

disqualify

Meaning
to officially prevent someone from participating or being eligible
Example
The referee decided to disqualify the player for cheating.
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 ˈdɪl.ɪ.dʒəns

diligence

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

inducement

Meaning
something that persuades or encourages someone to do something
Example
The company offered a bonus as an inducement to employees.
C1 noun /dʒɪst/

Gist

Meaning
the substance or essence of a speech or text; the main point
Example
I missed the beginning of the lecture, but I caught the gist of the professor's argument.
C1 noun /ˈlaɪm.laɪt/

Limelight

Meaning
the focus of public attention; a bright light produced by heating a cylinder of lime
Example
The celebrity enjoyed being in the limelight.
C1 adjective /kənˈspɪkjuəs/

conspicuous

Meaning
Easily noticeable; attracting attention due to being unusual or prominent.
Example
Her red dress made her conspicuous at the party.
C1 noun /ˈtɜːrbjələns/

turbulence

Meaning
Violent or unsteady movement of air, water, or some other fluid; disorder or conflict.
Example
The plane experienced severe turbulence during the flight.
C1 noun /ˈhɑː.stɪdʒ/

Hostage

Meaning
a person seized or held as security for the fulfillment of a condition; captive
Example
The police negotiated carefully to secure the release of all hostages unharmed.
C1 adjective ˈtæs.ɪt

tacit

Meaning
Understood or implied without being openly expressed or stated
Example
Their mutual understanding was based on tacit agreement.
C1 noun /ˈɪn.trə.vɜːrt/

introvert

Meaning
A person who tends to be shy and prefers spending time alone rather than in groups.
Example
As an introvert, he preferred reading over attending parties.
C1 noun /ˌsɒl.jʊˈbɪləti/

solubility

Meaning
The ability of a substance to dissolve in a solvent.
Example
The solubility of salt in water is high.
C1 noun ˈhaɪ.drə.dʒən ˈpaʊ.əd bʌsɪz

hydrogen-powered buses

Meaning
Buses powered by hydrogen fuel cells that produce only water vapor as emission.
Example
Hydrogen-powered buses reduce air pollution.
C1 noun /ˈnɪkəl/

nickel

Meaning
a small coin, typically worth five cents in the United States
Example
He found a nickel on the ground.
C1 verb /kənˈtɛkstʃuəlaɪz/

contextualize

Meaning
to place something in a context or interpret it in relation to its surroundings
Example
The teacher contextualized the historical event to make it more relevant for students.
C1 adjective /ˈneɡ.lɪ.dʒə.bəl/

Negligible

Meaning
so small or unimportant as to be not worth considering; insignificant
Example
The side effects of this medicine are negligible.
C1 adjective /ˈrɛtroʊˌɡreɪd/

retrograde

Meaning
moving backward or returning to a worse condition
Example
The policy was seen as a retrograde step for human rights.
C1 noun /ɡeɪdʒ/

Gauge

Meaning
an instrument for measuring the magnitude, amount, or contents of something
Example
The pressure gauge showed the tank was full.
C1 adjective /ˈheɪ.nəs/

Heinous

Meaning
extremely wicked or evil; abominable; morally reprehensible
Example
The heinous crime shocked the entire community.
C1 adverb kəmˈpæktli

compactly

Meaning
In a closely packed or dense manner.
Example
Protons and neutrons are compactly arranged.
C1 noun /ˌɑːrtʃˈbɪʃəp/

archbishop

Meaning
A senior bishop in charge of an archdiocese in the Christian Church.
Example
The archbishop delivered a sermon to thousands of people.
C1 noun /ˌdɪsəˈbiːdiəns/

disobedience

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

perilous

Meaning
Full of danger or risk; hazardous and threatening.
Example
The explorers took a perilous journey.
C1 adjective /ɡrəˈtjuːɪtəs/

gratuitous

Meaning
Unnecessary, unwarranted, or given freely without reason or cause.
Example
The movie was criticized for its gratuitous violence.
C1 adjective /ˈvæljuːləs/

valueless

Meaning
having no worth, importance, or usefulness
Example
The old broken phone was considered valueless.
C1 adjective /ˈrɛtɪsənt/

reticent

Meaning
not revealing one's thoughts or feelings readily; reserved
Example
She was reticent about her personal life.
C1 noun /ˈfɔːrdʒər/

forger

Meaning
a person who makes fake documents, artworks, or signatures
Example
The police arrested a forger who had been selling counterfeit paintings.
C1 noun /ˈkoʊhɔːrts/

cohorts

Meaning
Groups of people who share a common feature or experience.
Example
Researchers compared the health outcomes of different cohorts.
C1 noun /pɛnˈtæθlɒn/

pentathlon

Meaning
An athletic contest featuring five different events.
Example
She trained hard to compete in the modern pentathlon.
C1 adjective /ˈfuːlpruːf/

foolproof

Meaning
Designed to be very easy to use or understand, leaving no possibility of failure or error.
Example
The new software has a foolproof installation process.
C1 verb /pərˈspaɪər/

perspire

Meaning
To give out sweat through the pores of the skin as a result of heat, physical exertion, or stress.
Example
He began to perspire after running for 10 minutes.
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 noun /ˈstjuːpər/

stupor

Meaning
a state of near-unconsciousness or insensibility
Example
He remained in a stupor after hearing the shocking news.
C1 noun /krʌtʃ/

crutch

Meaning
a support used by someone injured to walk; also something relied upon for support or help
Example
He had to use crutches after breaking his leg.
C1 verb pleɪɡd

plagued

Meaning
Troubled or afflicted persistently by problems or difficulties.
Example
People are plagued by anxiety and depression.
C1 noun /ˈkɪləˌwɒt/

kilowatt

Meaning
a unit of power equal to 1,000 watts
Example
The generator produces ten kilowatts of electricity.
C1 adjective /ˈmɒdʒʊlər/

modular

Meaning
Employing or involving a module or modules as the basis of design or construction.
Example
The modular design allows for easy customization and scalability.
C1 noun /əˈrɪəz/

arrears

Meaning
Money that is owed and should have been paid earlier.
Example
She was months in arrears with her electricity bill.
C1 noun /krɪˈden.ʃəl/

credential

Meaning
a qualification, achievement, or aspect of a person's background used to indicate suitability for something
Example
She presented her credentials before starting the new job.
C1 noun lɪˈkwɪd.ə.ti

liquidity

Meaning
The availability of liquid assets to a market or company; the ability to convert assets into cash quickly.
Example
Maintaining liquidity is crucial for financial stability.
C1 adjective /ʌnˈsɪvəl/

Uncivil

Meaning
not polite or courteous; rude and discourteous in behavior
Example
His uncivil remarks during the meeting offended everyone present.
C1 verb /loʊð/

loathe

Meaning
to feel intense dislike or disgust for
Example
He absolutely loathes being late to meetings.
C1 noun ˈprəʊses stəˈbɪlɪti

process stability

Meaning
The consistency and steadiness of biological or functional processes
Example
Cold air ensures process stability in plants.