calibrate
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C1 verb /ˈkælɪˌbreɪt/

calibrate

Meaning
To adjust or mark something so it can be used accurately; to standardize.
Example
The technician calibrated the machine before starting the experiment.
C1 verb /ˈkæp.saɪz/

capsize

Meaning
to overturn in the water
Example
The small fishing boat capsized during the storm.
C1 noun /ˈkælkjʊləs/

calculus

Meaning
A branch of mathematics concerned with rates of change and accumulation; also a hard mineral deposit in the body such as on teeth.
Example
Calculus is essential for advanced studies in physics and engineering.
C1 adjective /ˈkɒn.keɪv/

concave

Meaning
curved inward like the inside of a bowl
Example
The mirror had a concave surface that magnified her reflection.
C1 verb /ˈsɪvɪlaɪz/

civilize

Meaning
to bring a society or group to a more developed, organized, or socially acceptable state; to educate and refine behavior
Example
Education can help civilize communities by promoting shared values and respect.
C1 verb /kəˈluːd/

collude

Meaning
To secretly cooperate or conspire with others, often for a deceitful purpose.
Example
The two companies colluded to fix prices in the market.
C1 noun /kəʊˈhiːʒən/

cohesion

Meaning
The action or fact of forming a united whole.
Example
The team showed excellent cohesion throughout the project.
C1 adjective /ˌkɒnvəˈlɛsnt/

convalescent

Meaning
recovering from an illness or medical treatment
Example
The hospital has a special ward for convalescent patients.
C1 noun /ˈkɒndɪmənts/

condiments

Meaning
Seasonings or sauces used to add flavor to food.
Example
Ketchup and mustard are popular condiments for burgers.
C1 adjective /ˈkæn.dɪd/

Candid

Meaning
truthful and straightforward; frank and honest in expression
Example
I appreciate your candid opinion about the project.
C1 adjective /kənˈtɛmptəbl/

contemptible

Meaning
deserving of contempt; despicable
Example
His deceitful actions were truly contemptible.
C1 noun /ˈkɒnfɪdænt/

confidant

Meaning
A person with whom one shares a secret or private matter, trusting them not to repeat it.
Example
She found a true confidant in her childhood friend.
C1 noun /ˈkoʊtʃ.mən/

Coachman

Meaning
a person who drives a horse-drawn carriage or coach
Example
The coachman skillfully guided the horses through the busy streets.
C1 verb, noun /klɑːɡ/

clog

Meaning
to block or become blocked; a type of heavy wooden shoe
Example
The sink was clogged with food waste.
C1 verb /ˈkʌn.dʒər/

conjure

Meaning
to summon something as if by magic; to imagine vividly
Example
The magician conjured a rabbit out of the hat.
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 noun /ˈkleɪmənt/

claimant

Meaning
a person who makes a claim, especially in a legal or financial context
Example
The claimant filed for compensation after the accident.
C1 verb /kəˈleɪt/

collate

Meaning
to collect, arrange, and combine in order
Example
The secretary collated the reports before the meeting.
C1 noun /ˈtʃɪz.əl/

Chisel

Meaning
a tool with a sharp flat edge used for cutting or shaping wood, stone, or metal
Example
The carpenter used a chisel to carve the wood.
C1 noun /ˈkɑːrkəs/

carcass

Meaning
the dead body of an animal, especially after being slaughtered
Example
Vultures fed on the carcass left in the field.
C1 adverb /ˌkɒnfɪˈdenʃəli/

Confidentially

Meaning
in a confidential manner; secretly; privately
Example
The information was shared confidentially between the two managers.
C1 noun /kəˈloʊkwiəˌlɪzəm/

colloquialism

Meaning
a word or phrase used in informal speech or writing
Example
The novel is full of regional colloquialisms.
C1 noun /ˈkɒb.lər/

Cobbler

Meaning
a person who repairs shoes and other leather goods
Example
The cobbler fixed my broken shoes perfectly.
C1 verb kəˈrɒb.ə.reɪt

corroborate

Meaning
Confirm or give support to a statement, theory, or finding.
Example
The witness corroborated the defendant's testimony.
C1 noun /ˈkroʊniˌɪzəm/

cronyism

Meaning
The practice of favoring friends or associates, especially in political appointments or business deals.
Example
The company was accused of cronyism in hiring practices.
C1 noun /ˈkroʊ.bɑːr/

Crowbar

Meaning
a heavy iron bar with a curved end used as a lever for prying things apart
Example
He used a crowbar to remove the old nails.
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 /kənˈstɪtʃuənsi/

constituency

Meaning
A geographical area whose residents elect a representative to a legislative body.
Example
She campaigned tirelessly across her constituency.
C1 adjective /kənˈtraɪvd/

contrived

Meaning
artificial or forced; not natural or spontaneous
Example
The ending of the movie felt contrived and unrealistic.
C1 adjective /kəˈləʊ.kwi.əl/

colloquial

Meaning
Used in ordinary conversation rather than formal speech or writing; informal language.
Example
His colloquial expressions made the speech relatable.
C1 noun /ˈkɑːmənˌwɛlθ/

commonwealth

Meaning
an independent community or state, especially one founded for the common good; also an association of nations
Example
Australia is a member of the Commonwealth of Nations.
C1 verb /ˈkrɪsən/

christen

Meaning
to give a name to someone at baptism or to name something officially
Example
They christened the ship after the queen.
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 noun /saɪˈteɪʃən/

citation

Meaning
a quotation from or reference to a book, paper, or author
Example
The research paper included a citation from Shakespeare.
C1 noun ˈkɑːr.bən ˌsiː.kwəˈstreɪ.ʃən

carbon sequestration

Meaning
The process of capture and long-term storage of atmospheric carbon dioxide to mitigate or defer global warming.
Example
Forests play a key role in carbon sequestration.
C1 noun /krʌks/

crux

Meaning
the most important or decisive point of an issue
Example
The crux of the problem lies in poor communication.
C1 adjective /kɔɪ/

coy

Meaning
reluctant to give details or reveal feelings; shy or reserved
Example
She gave a coy smile when asked about her plans.
C1 noun /kæʃ/

cache

Meaning
A hidden storage of items or a high-speed memory in computing.
Example
The hikers found a cache of supplies hidden under the rocks.
C1 noun /ˈkɔːrdən/

cordon

Meaning
a line or circle of police, soldiers, or guards preventing access
Example
The police set up a cordon around the crime scene.
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 /kɔːrs flaʊər/

Course flour

Meaning
coarsely ground flour with larger particles, typically used for baking bread
Example
She used course flour to make homemade bread with a rustic texture.
C1 noun /ˈkælɪbər/

caliber

Meaning
The quality of someone's ability or character; the internal diameter of a gun barrel.
Example
The university attracts students of high caliber.
C1 noun /ˌkɒnvəˈlɛsns/

convalescence

Meaning
the period of time spent recovering from an illness or medical treatment
Example
His convalescence lasted for almost two months after the accident.
C1 adjective /kəmˈpleɪsənt/

complacent

Meaning
showing self-satisfaction and a lack of concern about potential dangers or problems
Example
The team grew complacent after a few victories and stopped practicing hard.
C1 noun kənˈvɜː.dʒəns

convergence

Meaning
The process of coming together from different directions to meet at a common point; unification or integration.
Example
The convergence of technologies is revolutionizing industries.
C1 noun ˈkəmˌpaʊndɪŋ

compounding

Meaning
The process whereby interest is added to an amount of money and future interest is calculated on the total.
Example
Compounding interest increases the value of investments over time.
C1 noun /ˌkɔr.diˈæl.ɪ.ti/

Cordiality

Meaning
sincere affection and kindness; warm and friendly behavior
Example
The host's cordiality made all the guests feel welcome and comfortable.
C1 noun /tʃɪt/

Chit

Meaning
a short note, typically a brief informal letter; a voucher for a sum owed
Example
She left a chit on the table asking him to call her back.
C1 adjective, verb, noun /ˈkaʊntərfɪt/

counterfeit

Meaning
made to look like something genuine in order to deceive
Example
The police seized a batch of counterfeit currency.
C1 verb /ˈkæptɪveɪt/

captivate

Meaning
to attract and hold the interest of; to charm or fascinate
Example
Her beautiful voice captivated the audience.
C1 noun/verb /ˈkætəpʌlt/

catapult

Meaning
A device for launching objects at high speed; to hurl or launch something suddenly.
Example
The invention catapulted him to international fame.
C1 noun /ˈkɒntrəbænd/

contraband

Meaning
goods that are illegal to import, export, or possess
Example
The police seized a shipment of contraband cigarettes.
C1 noun /ˈtʃænsələr/

chancellor

Meaning
A senior state or legal official, or the head of a university.
Example
The chancellor delivered an inspiring speech at the graduation ceremony.
C1 noun /krʊk/

crook

Meaning
a dishonest person, especially a criminal
Example
The police finally caught the crook who had been stealing cars.
C1 noun ˈkætəlɪst

catalyst

Meaning
A person or thing that precipitates an event or change.
Example
His speech acted as a catalyst for change in the community.
C1 adjective /ˈkɒnvɛks/

convex

Meaning
curved or rounded outward
Example
The lens has a convex shape to focus light.
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 adjective /klaɪˈmæktɪk/

climactic

Meaning
Relating to the most exciting or important moment of something.
Example
The film ended with a climactic battle scene.
C1 noun /ˈsɛtərə/

cetera

Meaning
Latin for 'the rest' or 'others'; commonly used in the phrase 'et cetera' meaning 'and so on'.
Example
We need to buy pens, paper, notebooks, et cetera.
C1 noun /ˈkæn.ɪ.bəl/

Cannibal

Meaning
a person who eats the flesh of other human beings
Example
The explorer's journal described rumors of cannibals living on the remote island.
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 adjective, noun /ˈkɔːrpərəl/

corporal

Meaning
relating to the body; a low-ranking officer in the military
Example
He suffered a corporal punishment for his mistake.
C1 verb /kənˈtraɪv/

contrive

Meaning
to plan or devise cleverly or skillfully
Example
She contrived a clever plan to surprise her friends.
C1 noun /ˌkɒn.əˈsɜːr/

connoisseur

Meaning
an expert judge in matters of taste, especially in food, art, or wine
Example
She is a true connoisseur of fine art.
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 verb /kənˈfleɪt/

conflate

Meaning
To combine two or more things, often confusingly, into one.
Example
The article tends to conflate facts with opinions.
C1 noun /kənˈvʌl.ʃən/

convulsion

Meaning
a sudden, violent, involuntary contraction of muscles; a seizure
Example
The medicine helped prevent convulsions in children.
C1 adjective /ˌkɒzməˈpɒlɪtən/

cosmopolitan

Meaning
familiar with and at ease in many different countries and cultures
Example
He has a cosmopolitan outlook due to his extensive travels.
C1 noun /ˈkʌn.stə.bəl/

constable

Meaning
a police officer of the lowest rank
Example
The constable directed traffic at the busy intersection.
C1 noun /ˈkaʊn.tər kleɪm/

counter-claim

Meaning
a claim made to rebut a previous claim, often in legal contexts
Example
The defendant filed a counter-claim against the plaintiff.
C1 adjective /ˈkɔːrəl/

choral

Meaning
Relating to, written for, or performed by a choir or chorus.
Example
The church hosted a choral performance on Sunday.
C1 adjective /ˈtʃɪə.ləs/

Cheerless

Meaning
lacking happiness or comfort; gloomy; depressing; without cheer
Example
The old house looked cheerless and abandoned in the winter rain.
C1 verb /tʃæsˈtaɪz/

chastise

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

chassis

Meaning
the base frame of a vehicle or other wheeled machine
Example
The mechanic examined the car's chassis for damage.
C1 noun /ˈkɑːrtɪlɪdʒ/

cartilage

Meaning
A firm, flexible connective tissue found in various parts of the body such as joints, ear, and nose.
Example
The doctor explained that the injury damaged the cartilage in his knee.
C1 noun /ˈsɪtəˌdɛl/

citadel

Meaning
A fortress protecting or dominating a city.
Example
The ancient citadel stood guard over the town for centuries.
C1 noun /ˌkɒnfləˈɡreɪʃən/

conflagaration

Meaning
This is a common misspelling of 'conflagration', which means a large, destructive fire.
Example
The term 'conflagaration' is often incorrectly used instead of 'conflagration'.
C1 adjective /ˈkɔːʃənˌɛri/

cautionary

Meaning
serving as a warning; intended to prevent problems or mistakes by giving advice or examples
Example
The report offers a cautionary message about unchecked spending.
C1 adjective ˈkrɪp.tɪk

cryptic

Meaning
Having a meaning that is mysterious or obscure; difficult to understand.
Example
The message was cryptic and hard to decipher.
C1 verb /kənˈspaɪər/

conspire

Meaning
to secretly plan with others to do something harmful or illegal
Example
They conspired to overthrow the government.
C1 noun /ˈkæviˌæt/

caveat

Meaning
a warning or condition to be considered before taking action
Example
The proposal was accepted with one caveat.
C1 adjective/verb /ˈkɒn.sə.mət/

consummate

Meaning
To complete or perfect something with great skill
Example
He is a consummate artist with years of experience.
C1 adjective /ˈkjʊərəbl/

curable

Meaning
Able to be cured or healed.
Example
The doctor assured her that the disease was curable.
C1 noun /kjʊˈreɪtər/

curator

Meaning
a person who is responsible for the care and management of a museum, gallery, or collection
Example
The curator organized a new exhibition of ancient artifacts.
C1 adjective ˈkɒn.təm.plə.tɪv

contemplative

Meaning
Expressing or involving prolonged thought; meditative and reflective.
Example
He spent a contemplative evening reflecting on his decisions.
C1 adjective ˈser.ɪ.brəl

cerebral

Meaning
Of the cerebrum of the brain.
Example
Cerebral functions regulate thoughts.
C1 noun, adjective /ˈsɛntənəri/ or /sɛnˈtɛnəri/

centenary

Meaning
The hundredth anniversary of a significant event; relating to a period of 100 years.
Example
The school celebrated its centenary with a grand event.
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 verb /kraʊtʃ/

crouch

Meaning
to bend your knees and lower your body close to the ground
Example
The cat crouched before leaping at its prey.
C1 adjective /ˌkævəˈlɪər/

cavalier

Meaning
showing a lack of proper concern; dismissive or offhand
Example
He had a cavalier attitude toward safety regulations.
C1 adjective /kəˈnɒnɪkəl/

canonical

Meaning
Conforming to a general rule or accepted standard; officially recognized.
Example
Shakespeare’s works are considered canonical in English literature.
C1 noun /ˈkʌvənənt/

covenant

Meaning
a formal agreement or promise, often legally binding
Example
The landlord and tenant signed a covenant to maintain the property.
C1 verb /kənˈkɜːr/

concur

Meaning
To agree with someone or something.
Example
I concur with your opinion on this matter.
C1 verb /ˈkəʊ.dɪ.faɪ/

codify

Meaning
to arrange laws, rules, or ideas into a clear and systematic code
Example
The committee worked to codify the existing laws.
C1 noun /kənˈsiːt/

conceit

Meaning
excessive pride in oneself; vanity
Example
His conceit made him unpopular among his colleagues.
C1 adjective, noun /ˈsɛlɪbət/

celibate

Meaning
abstaining from marriage and sexual relations; a person who does so
Example
He chose to remain celibate for religious reasons.
C1 noun /ˈkɑːrtrɪdʒ/

cartridge

Meaning
A container holding a substance or device, such as ink for printers or bullets for firearms.
Example
The printer stopped working because the ink cartridge was empty.
C1 adjective /ˌkætəˈklɪzmɪk/

cataclysmic

Meaning
Relating to or denoting a violent natural event or upheaval.
Example
The war had cataclysmic effects on the nation's economy.
C1 noun /ˈkɒnstənsi/

constancy

Meaning
the quality of being faithful and dependable
Example
Her constancy in friendship is admirable.
C1 adjective /ˈkɔː.zəl/

causal

Meaning
relating to or acting as a cause
Example
There is a causal link between smoking and cancer.
C1 verb /tʃɑːr/

char

Meaning
To burn or scorch something so that it becomes blackened.
Example
The cook accidentally charred the steak.
C1 noun /ˈʃɪvəlri/

chivalry

Meaning
The medieval knightly system with its moral, social, and religious code; courteous behavior, especially toward women.
Example
The knight lived by the code of chivalry.
C1 noun /ˌkʌl də ˈsæk/

cul de sac

Meaning
A street or passage closed at one end; a dead end.
Example
They bought a house at the end of a quiet cul de sac.
C1 noun /ˌkɒk.əˈtuː/

Cockatoo

Meaning
a large parrot with a prominent crest that can be raised or lowered
Example
The white cockatoo raised its beautiful crest.
C1 noun ˌkɒn.ʃiˈen.ʃəs.nəs

conscientiousness

Meaning
The quality of wishing to do one's work or duty well and thoroughly; diligence.
Example
Her conscientiousness in work led to a well-organized project.
C1 adjective /ˈkjuːmjələtɪv/

cumulative

Meaning
Increasing gradually by addition; growing in quantity, force, or effect.
Example
The cumulative effect of stress can harm your health.
C1 noun /ˈsɛntɪˌliːtər/

centiliter

Meaning
A metric unit of capacity equal to one hundredth of a liter.
Example
The recipe calls for 20 centiliters of milk.
C1 noun kəˈmjunəl ˈhɑrməni

communal harmony

Meaning
Peaceful coexistence and cooperation among different groups in a community.
Example
Maintaining communal harmony requires mutual respect and understanding.
C1 verb /ˈsenʃər/

censure

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

calculating

Meaning
acting in a scheming and ruthlessly determined way
Example
He had a cold and calculating approach to business.
C1 adjective /kənˈsɛntrɪk/

concentric

Meaning
having a common center, as in circles or spheres
Example
The artist drew concentric circles on the canvas.
C1 adjective /kənˈsɪliətɔːri/

conciliatory

Meaning
intended to make someone less angry or more agreeable; soothing
Example
She spoke in a conciliatory tone to ease the tension.
C1 noun /kəˈmoʊʃən/

commotion

Meaning
A state of noisy confusion or disturbance.
Example
The sudden commotion in the market drew everyone's attention.
C1 noun /ˈtʃæplɪn/

chaplain

Meaning
A member of the clergy attached to a private chapel, institution, hospital, or military unit.
Example
The army chaplain offered prayers before the battle.
C1 adjective /kənˈvɜːrdʒənt/

convergent

Meaning
tending to move toward a common point or result
Example
The two rivers have a convergent path before entering the lake.
C1 verb /kɜːrˈteɪl/

curtail

Meaning
to reduce or limit something, especially something considered undesirable
Example
The company had to curtail its spending due to budget cuts.
C1 noun /ˈkævərn/

cavern

Meaning
a large cave or chamber in a cave
Example
The explorers entered a dark cavern beneath the mountain.
C1 noun /ˌkɒnstəˈneɪʃən/

consternation

Meaning
A feeling of anxiety, dismay, or confusion, often caused by something unexpected.
Example
The sudden announcement caused widespread consternation among the employees.
C1 verb /ˈkaʊər/

cower

Meaning
to crouch down in fear
Example
The child cowered behind the sofa during the thunderstorm.
C1 verb /kənˈdəʊn/

condone

Meaning
To accept or allow behavior that is morally wrong or offensive.
Example
The manager refused to condone harassment in the workplace.
C1 verb /klɪntʃ/

clinch

Meaning
To secure or settle something decisively; to grasp tightly.
Example
The team clinched the championship with a last-minute goal.