calculus
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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 noun /ˈkæləs/

callus

Meaning
A thickened and hardened part of the skin or soft tissue, especially in an area subjected to friction.
Example
A callus formed on his palm from using tools every day.
C1 noun /sɛˈseɪʃən/

cessation

Meaning
The fact or process of ending or being brought to an end.
Example
There was a temporary cessation of hostilities.
C1 noun /kənˈtɪn.ju.əns/

continuance

Meaning
the state of continuing or being prolonged; persistence
Example
The continuance of the project depended on securing additional funding.
C1 adjective /ˈkæn.dɪd/

Candid

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

cartographer

Meaning
A person who makes maps.
Example
The cartographer carefully drew the map of the new territory.
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 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 /kəˈluːʒən/

collusion

Meaning
A secret agreement or cooperation, especially for an illegal or dishonest purpose.
Example
There was evidence of collusion between the officials and the contractors.
C1 verb /kənˈkɜːr/

concur

Meaning
To agree with someone or something.
Example
I concur with your opinion on this matter.
C1 noun /kræɡ/

crag

Meaning
a steep or rugged cliff or rock face
Example
The hikers climbed the jagged crag to reach the summit.
C1 adjective /ˈkælkjʊleɪtɪŋ/

calculating

Meaning
acting in a scheming and ruthlessly determined way
Example
He had a cold and calculating approach to business.
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 verb /klɪntʃ/

clinch

Meaning
To secure or settle something decisively; to grasp tightly.
Example
The team clinched the championship with a last-minute goal.
C1 verb /ˈkɒŋɡrɪɡeɪt/

congregate

Meaning
to gather together in a group; to assemble
Example
People congregate in the town square every evening.
C1 adverb kəmˈpæktli

compactly

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

confound

Meaning
to confuse or surprise someone, often by acting against their expectations
Example
The magician's trick seemed to confound the entire audience.
C1 verb /kənˈviːn/

convene

Meaning
to come together or assemble, especially for a meeting or formal gathering
Example
The board will convene tomorrow to discuss the new policy.
C1 noun /kənˈkʌrəns/

concurrence

Meaning
Agreement or union in action, opinion, or occurrence; simultaneous happening of events.
Example
The project was completed with the concurrence of all departments.
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 verb /kənˈfleɪt/

conflate

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

compensatory

Meaning
serving to make up for a loss, damage, or injury
Example
The court awarded him compensatory damages.
C1 noun kənˈɡlɒm.ər.ət

conglomerate

Meaning
A large corporation formed by the merging of separate and diverse firms.
Example
The company grew into a multinational conglomerate.
C1 noun /ˈkaʊərdɪs/

cowardice

Meaning
lack of courage; behavior showing fear
Example
His cowardice prevented him from speaking up.
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 adjective /ˈkæl.əs/

Callous

Meaning
showing or having an insensitive and cruel disregard for others; emotionally hardened
Example
He showed a callous disregard for others' feelings.
C1 noun /krəˈvæs/

crevasse

Meaning
a deep crack in a glacier or the earth’s surface
Example
The climbers carefully crossed the icy crevasse.
C1 noun /klaʊt/

clout

Meaning
influence or power, especially in politics or business
Example
The businessman has a lot of political clout.
C1 noun /ˈkjuːmɪn/

Cumin

Meaning
A spice made from the dried seeds of a plant in the parsley family, with a warm earthy flavor
Example
Cumin is an essential spice in Indian and Middle Eastern cooking.
C1 verb/noun /ˈkrɒn.ɪ.kəl/

chronicle

Meaning
To record events in the order in which they happened; a written record of historical events.
Example
She decided to chronicle her journey through a blog.
C1 verb /ˈkrʌmpəl/

crumple

Meaning
to crush something into folds or wrinkles
Example
He crumpled the paper and threw it in the bin.
C1 noun ˌsɛn.trə.laɪˈzeɪ.ʃən

centralization

Meaning
The concentration of control and decision-making power in a central authority.
Example
Excessive centralization can slow down decision-making.
C1 noun /kənˈspɪrə.tər/

conspirator

Meaning
a person who secretly plans with others to do something unlawful or harmful
Example
The conspirator was arrested before the plan could be carried out.
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 noun /ˌkɒŋɡrɪˈɡeɪʃən/

congregation

Meaning
a group of people assembled for religious worship or a common purpose
Example
The congregation gathered to hear the sermon.
C1 verb /kənˈsɛptʃuəlaɪz/

conceptualize

Meaning
to form an idea or concept of something in your mind
Example
The artist conceptualized a new design for the exhibition.
C1 noun /ˈkaʊn.tə.nəns/

countenance

Meaning
a person's face or expression; support or approval
Example
Her cheerful countenance brightened the room.
C1 adverb /ˌkɒnfɪˈdenʃəli/

Confidentially

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

cavalier

Meaning
showing a lack of proper concern; dismissive or offhand
Example
He had a cavalier attitude toward safety regulations.
C1 noun, verb /kriːs/

crease

Meaning
a line or fold produced on paper, cloth, or other material; to make a fold or wrinkle
Example
She ironed the shirt carefully to remove every crease.
C1 noun /ˌkɒndʒʊˈɡeɪʃən/

conjugation

Meaning
the variation of the form of a verb to indicate tense, person, and number
Example
French verbs have complex conjugations.
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 /kəˈθɑːrsɪs/

catharsis

Meaning
The process of releasing strong emotions, providing relief.
Example
Writing in her diary was a form of catharsis for her.
C1 noun kɒɡˈnɪʃ.ən

cognition

Meaning
The mental action or process of acquiring knowledge and understanding through thought, experience, and the senses.
Example
Cognition plays a key role in learning.
C1 noun /kənˈtɛnʃən/

contention

Meaning
heated disagreement or argument; a point asserted in debate
Example
The main contention between the two parties was over tax reform.
C1 noun /ˈkɒb.lər/

Cobbler

Meaning
a person who repairs shoes and other leather goods
Example
The cobbler fixed my broken shoes perfectly.
C1 noun /kənˈfaɪnmənt/

confinement

Meaning
the state of being confined or restricted
Example
The prisoner endured years of confinement.
C1 noun /kənˈdəʊləns/

condolence

Meaning
An expression of sympathy, especially on the occasion of death.
Example
She offered her sincere condolence to the grieving family.
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 noun /ˈkʌl.ən.dər/

Colander

Meaning
a bowl-shaped kitchen utensil with holes in it used for draining food such as pasta or rice
Example
She drained the pasta using a colander.
C1 adjective /ˈkoʊvərt/

covert

Meaning
hidden, secret, or not openly acknowledged
Example
The spy conducted a covert operation behind enemy lines.
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 /kənˈspaɪər/

conspire

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

Consolidation

Meaning
The process of converting newly learned information into long-term memory
Example
Sleep plays a key role in memory consolidation.
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 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 /ˈkænən/

canon

Meaning
A general law, rule, principle, or collection of sacred books accepted as genuine.
Example
The book is now considered part of the literary canon.
C1 adjective /ˈkʌlpəbl̩/

culpable

Meaning
deserving blame or responsibility for a wrongdoing
Example
The judge found him culpable for the accident.
C1 noun /koʊˈɜː.ʃən/

coercion

Meaning
The practice of persuading someone to do something by using force or threats.
Example
Cybercriminals use coercion to extract information.
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 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 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 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 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 /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 noun /kənˈfɛdərəsi/

confederacy

Meaning
a group of states, people, or organizations united for a common purpose
Example
The southern states formed a confederacy during the civil war.
C1 adjective /kəˈmɛmərətɪv/

commemorative

Meaning
Serving as a reminder or in honor of a person or event.
Example
They issued a commemorative coin for the independence anniversary.
C1 noun /kəmˈpʌl.ʃən/

Compulsion

Meaning
the action or state of forcing or being forced to do something; an irresistible urge to behave in a certain way
Example
He felt a strong compulsion to check his phone every few minutes.
C1 noun /ˈkæv.əl.ri/

Cavalry

Meaning
soldiers who fight on horseback; the part of an army formerly composed of troops on horseback
Example
The cavalry charged across the field with great speed.
C1 noun /ˈkæpɪˌlɛri/

capillary

Meaning
a very thin blood vessel that connects arteries and veins
Example
Oxygen passes from the blood into tissues through capillaries.
C1 noun /ˈkɒndɪmənts/

condiments

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

coax

Meaning
to persuade someone gently or gradually to do something
Example
She managed to coax the cat out of the tree with some food.
C1 adjective kənˈkɝː.ənt

concurrent

Meaning
Existing, happening, or done at the same time.
Example
The conference had concurrent sessions on various topics.
C1 verb /kʌl/

cull

Meaning
to select or remove from a larger group, often to reduce numbers
Example
The farmers decided to cull the sick animals from the herd.
C1 verb ˌsɝː.kəmˈvent

circumvent

Meaning
To cleverly avoid or find a way around obstacles or rules.
Example
He tried to circumvent the security system.
C1 adjective /ˈkæni/

canny

Meaning
Having good judgment, especially in business or practical matters; shrewd.
Example
She made a canny investment in real estate.
C1 noun /ˈʃoʊ.və.nɪst/

chauvinist

Meaning
A person displaying excessive or prejudiced loyalty to a group, cause, or gender.
Example
He was labeled a chauvinist after his remarks about women in the workplace.
C1 verb /ˈsenʃər/

censure

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

commemorate

Meaning
To honor and remember someone or something through a ceremony or action.
Example
The statue was built to commemorate the fallen heroes.
C1 adjective/noun /ˈkɜːrsɪv/

cursive

Meaning
Written with characters joined together in a flowing manner.
Example
The teacher asked students to write the essay in cursive handwriting.
C1 adjective /kræs/

crass

Meaning
lacking sensitivity, refinement, or intelligence
Example
His crass remarks offended everyone at the meeting.
C1 noun /ˈklɛmənsi/

clemency

Meaning
mercy, leniency, or forgiveness shown towards someone
Example
The judge showed clemency and reduced his sentence.
C1 noun /ˈkɔːl.drən/

Cauldron

Meaning
a large metal pot with a lid and handle, used for cooking over a fire
Example
The witch stirred her potion in a large cauldron.
C1 noun /ˈkɒlərə/

cholera

Meaning
An infectious disease of the small intestine causing severe vomiting and diarrhea.
Example
The village suffered an outbreak of cholera after the flood.
C1 noun /kəˈlæm.ɪ.ti/

Calamity

Meaning
an event causing great and often sudden damage or distress; a disaster
Example
The earthquake was a terrible calamity that affected thousands of families.
C1 verb /ˌkɒntrəˈviːn/

contravene

Meaning
to go against or act in opposition to a law, rule, or agreement
Example
He contravened the safety regulations and was fined.
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 /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 /ˈkrɛvɪs/

crevice

Meaning
a narrow crack or opening, especially in a rock or wall
Example
The lizard hid in a crevice between the stones.
C1 verb /kəˈleɪt/

collate

Meaning
to collect, arrange, and combine in order
Example
The secretary collated the reports before the meeting.
C1 adjective ˌkaʊntəprəˈdʌktɪv

counterproductive

Meaning
Having the opposite of the desired effect; tending to hinder rather than help.
Example
Counterproductive activities often stem from dissatisfaction.
C1 adjective ˈser.ɪ.brəl

cerebral

Meaning
Of the cerebrum of the brain.
Example
Cerebral functions regulate thoughts.
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 adjective ˈkɒn.və.luː.tɪd

convoluted

Meaning
Extremely complex and difficult to follow; twisted or intricate.
Example
His argument was so convoluted that no one understood it.
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 /kənˈtɪnjuəm/

continuum

Meaning
A continuous sequence in which adjacent elements are not perceptibly different from each other, but the extremes are quite distinct.
Example
Life and death are often seen as part of the same continuum.
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 noun /kənˈsiːt/

conceit

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

contemptuous

Meaning
showing or expressing contempt; scornful
Example
She gave him a contemptuous glance.
C1 adjective /kənˈdʒiːniəl/

congenial

Meaning
pleasant and friendly because of having similar interests or qualities
Example
They found the café a congenial place to meet and talk.
C1 adjective /ˌkɒmprɪˈhɛnsəbl/

comprehensible

Meaning
able to be understood; intelligible
Example
The teacher explained the topic in a comprehensible way.
C1 verb /tʃɑːr/

char

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

Ceaseless

Meaning
continuing without pause or interruption; endless
Example
The ceaseless rain lasted for three days.
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 noun /ˈkoʊmə/

coma

Meaning
A deep state of prolonged unconsciousness caused by illness or injury.
Example
The patient remained in a coma for several weeks.
C1 adjective /kənˈɡrɛʃənl/

congressional

Meaning
relating to a congress, especially the US Congress
Example
The bill received strong congressional support.
C1 noun /kəˈmændər ɪn tʃiːf/

Commander-in-chief

Meaning
the supreme leader of a nation's armed forces
Example
The president serves as the commander-in-chief of the military.
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 /ˈkaʊntərˌpɔɪnt/

counterpoint

Meaning
an argument, idea, or theme contrasting with another; also a musical term for independent melody
Example
Her calm attitude was a counterpoint to his anger.
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 noun kəˈmɛns.mənt

commencement

Meaning
The beginning of something; a ceremony at which degrees or diplomas are conferred on graduating students.
Example
The commencement ceremony marked the start of a new journey.
C1 adjective ˌkɒn.ʃiˈen.ʃəs

conscientious

Meaning
Wishing to do what is right, especially to do one's work or duty well and thoroughly.
Example
A conscientious worker always delivers high-quality results.
C1 verb /kəmˈprɛs/

compress

Meaning
to press or squeeze something so that it becomes smaller
Example
The file was compressed to save storage space.
C1 verb /ˌkɒm.pɑːtˈmen.təl.aɪz/

compartmentalize

Meaning
To divide into sections or categories; to separate things into compartments.
Example
To increase efficiency, he compartmentalized his work tasks.
C1 noun /kəˈpɪl.ər.iz/

capillaries

Meaning
Any of the fine branching blood vessels that form a network between the arterioles and venules.
Example
Broken capillaries cause dark circles.
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 /ˈkʌntrɪmən/

countryman

Meaning
a person from one's own country or rural area
Example
He was proud to meet a fellow countryman at the international conference.
C1 verb /ˈkɒnfɪskeɪt/

confiscate

Meaning
to take something away officially, often as a punishment
Example
The teacher confiscated the student's phone during class.
C1 adjective /ˈkɑːr.di.æk/

cardiac

Meaning
Relating to the heart.
Example
The patient was admitted with a cardiac condition.
C1 noun /kæpˈtɪv.ɪ.ti/

Captivity

Meaning
the condition of being imprisoned or confined
Example
After years of captivity, the prisoner was finally released.
C1 noun /kəˈnʌn.drəm/

conundrum

Meaning
A complex problem or puzzle without an easy solution
Example
The ethical conundrum puzzled the researchers.