corrosion
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C1 noun kəˈrəʊ.ʒən

corrosion

Meaning
The gradual destruction of materials by chemical or electrochemical reaction, especially of metals by oxidation.
Example
Corrosion in pipes leads to leakage.
B2 adjective /ˈklæsɪfaɪd/

classified

Meaning
arranged into categories; officially secret or restricted
Example
The report contains classified information and cannot be shared publicly.
C1 adjective /klæd/

clad

Meaning
dressed or covered in a particular way
Example
The knight was clad in shining armor.
A2 noun /kæb/

cab

Meaning
a taxi or car for hire with a driver
Example
We took a cab to the airport.
B1 noun /kɔːr/

core

Meaning
the central or most important part of something
Example
Honesty is at the core of their values.
B2 verb, noun /kəˈmjuːt/

commute

Meaning
Verb: to travel regularly between home and work; Noun: the journey to and from work.
Example
He commutes two hours every day to reach his office.
C2 adjective /ˈkoʊltɪʃ/

coltish

Meaning
Playful, energetic, and not fully mature or disciplined.
Example
The coltish boy ran around the field without a care.
B1 adverb /ˈtʃɪəfəli/

cheerfully

Meaning
in a happy and positive manner; with visible good spirits
Example
She greeted everyone cheerfully despite the long day.
B1 adjective /ˈklæsɪk/

classic

Meaning
Judged over a period of time to be of the highest quality and outstanding of its kind.
Example
That movie is a classic example of 90s comedy.
B2 noun /tʃɔːr/

chore

Meaning
A routine task, especially a household duty.
Example
Washing the dishes is my least favorite chore.
C1 noun/verb /ˈsaɪ.fər/

cipher

Meaning
A secret or disguised way of writing; a code; to put a message into secret writing.
Example
Military messages are protected using a cipher.
C1 adjective /kəmˈplɪsɪt/

complicit

Meaning
involved with others in an illegal activity or wrongdoing
Example
He was found complicit in the crime.
B2 noun /ˈkæriər/

carrier

Meaning
A person or thing that carries, transports, or conveys something; also an organization that provides transport services.
Example
The airline is the largest carrier in the country.
C2 noun /ˈkloʊðiər/

clothier

Meaning
a person or company that makes, sells, or deals in clothes.
Example
The town’s clothier displayed fine suits in his shop window.
C2 noun /ˈklɪpər/

clipper

Meaning
a tool used for cutting, or a fast sailing ship of the 19th century
Example
The barber used clippers to trim his hair.
A2 noun /ˈkɜːr.tən/

Curtain

Meaning
a piece of material suspended at the top to form a covering or screen, typically movable sideways
Example
She drew the curtains to block out the bright sunlight.
A2 noun /kəˈlek.ʃən/

Collection

Meaning
a group of objects gathered together; the action or process of collecting
Example
She has an impressive collection of vintage books in her library.
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 /ˈkɒnvɛks/

convex

Meaning
curved or rounded outward
Example
The lens has a convex shape to focus light.
B2 noun ˈkærɪktər dɪˈvɛləpmənt

character development

Meaning
The process of creating a believable character in fiction by giving the character depth and personality.
Example
The character development of Sydney Carton is profound.
C2 noun /ˈklæpər/

clapper

Meaning
The free-swinging metal piece inside a bell that strikes it to produce sound.
Example
The clapper inside the bell was broken.
B1 noun /kæmˈpeɪn/

Campaign

Meaning
an organized course of action to achieve a particular goal; a series of military operations
Example
The environmental campaign successfully raised awareness about climate change.
A1 verb /kɔːst/

cost

Meaning
to have a price of; to require payment; to cause loss
Example
This book will cost twenty dollars.
B2 verb /ˈkaʊnsəl/

counsel

Meaning
to give professional advice or guidance to someone
Example
The teacher counseled the students on their career choices.
C2 adjective /ˈkɔːpjʊlənt/

corpulent

Meaning
fat or obese; having a large bulky body
Example
The corpulent man struggled to fit into the small chair.
C2 verb /ˌkɒntrəˈvɜːrt/

controvert

Meaning
to dispute or argue against; to contradict
Example
The scientist controversed the previous research findings.
C1 adjective ˈkʌm.bə.səm

cumbersome

Meaning
Heavy, unwieldy, difficult to handle or carry.
Example
The cumbersome luggage slowed him down.
B2 verb /klæʃ/

clash

Meaning
to come into conflict or collision with something or someone.
Example
The two cars clashed in the intersection.
C2 noun /ʃɪˈkeɪnəri/

chicanery

Meaning
The use of trickery or deception to achieve a purpose.
Example
The politician was accused of chicanery to win the election.
A2 adjective /ˈkruːəl/

cruel

Meaning
Willfully causing pain or suffering to others, or feeling no concern about it.
Example
It was cruel to make fun of the injured boy.
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.
B1 adjective /ˈtʃælɪndʒɪŋ/

challenging

Meaning
difficult in a way that tests one's abilities
Example
The mountain climb was challenging but rewarding.
A1 noun/verb /ˈkʊkɪŋ/

cooking

Meaning
the process of preparing food by heating it
Example
Cooking is one of my favorite hobbies.
B2 noun /ˈkæs.ər.oʊl bɑːks/

Casserole box

Meaning
a covered dish used for cooking and serving food, especially baked dishes
Example
The casserole box kept the food warm during the dinner party.
B1 noun /ˈtʃɛərˌwʊmən/

chairwoman

Meaning
a woman who presides over a meeting, committee, or organization; a female leader of a board or council
Example
She was elected chairwoman of the company after years of experience.
C2 noun /ˈkɒnk.leɪv/

conclave

Meaning
a private meeting, especially a secret or important one
Example
The leaders met in a secret conclave to discuss the strategy.
B1 noun /kruː/

crew

Meaning
A group of people working together, especially on a ship, aircraft, or project.
Example
The ship's crew worked tirelessly during the storm.
B1 noun /ˈkɑn.træst/

Contrast

Meaning
the state of being strikingly different from something else; comparison showing differences
Example
The contrast between city life and rural life is quite remarkable.
B2 verb /kənˈsiːv/

conceive

Meaning
to form or imagine an idea in the mind; to become pregnant
Example
It is hard to conceive how such an idea could succeed.
B2 noun kəmˈpet.ɪ.tɪv.nəs

competitiveness

Meaning
The quality of being as good as or better than others of a comparable nature; the ability to compete successfully.
Example
Competitiveness is vital for economic sustainability.
B1 noun /ˈkrɪtɪˌsɪzəm/

criticism

Meaning
The expression of disapproval or judgment of the merits of something
Example
The new policy has faced a lot of criticism from the public.
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.
B1 noun /ˈsiːlɪŋ/

ceiling

Meaning
the upper interior surface of a room
Example
The ceiling of the hall was painted beautifully.
C1 adjective /ˈkɒn.ɪ.fər.əs/

coniferous

Meaning
Relating to cone-bearing trees that usually have needle-like leaves and remain green year-round.
Example
Pine trees are coniferous and grow in colder climates.
B2 noun, verb /kɜːrs/

curse

Meaning
a solemn wish that harm or misfortune should befall someone; a rude or offensive word or phrase; to utter offensive words or wish harm upon someone
Example
He cursed loudly when he realized he had lost his wallet.
B2 noun /kɔːrps/

corpse

Meaning
a dead body, especially of a human
Example
The police discovered a corpse in the abandoned house.
B1 noun /səˈlɛbrɪti/

celebrity

Meaning
a famous person, especially in entertainment or sports
Example
The celebrity was surrounded by fans at the airport.
B2 adjective kəˈlɛktɪv

collective

Meaning
Done by people acting as a group; shared by all members of a group.
Example
Victory Day represents our collective pride.
B2 noun /ˈkeɪ.ɒs/

Chaos

Meaning
complete disorder and confusion; a state of total confusion with no order
Example
The earthquake caused chaos in the city as buildings collapsed and people panicked.
A2 adjective /ˈkɒmɪk/

comic

Meaning
causing or meant to cause laughter
Example
The movie had several comic scenes.
B2 verb /kənˈfes/

confess

Meaning
to admit guilt or wrongdoing; to acknowledge
Example
He confessed his mistake to his teacher.
B2 adjective /kəˈrɛspɒndɪŋ/

corresponding

Meaning
matching or related to something
Example
The corresponding page in the book explains the process in detail.
B1 noun /ˌsiːiːˈoʊ/

ceo

Meaning
The highest-ranking person in a company, responsible for overall management.
Example
The CEO announced a new strategy for the company.
A2 adjective /ˈkɒm.ən/

common

Meaning
occurring frequently or widely; shared by all
Example
It is common to see traffic in the city during rush hour.
C1 adjective /kənˈtɛmptʃuəs/

contemptuous

Meaning
showing or expressing contempt; scornful
Example
She gave him a contemptuous glance.
C2 adjective /kəmˈpleɪzənt/

complaisant

Meaning
willing to please others or to accept what they do or say without protest
Example
He was too complaisant to refuse their demands.
C1 adjective /ˈkjʊərəbl/

curable

Meaning
Able to be cured or healed.
Example
The doctor assured her that the disease was curable.
B2 noun /kənˈkʌʃən/

concussion

Meaning
A temporary unconsciousness or shock caused by a blow to the head.
Example
He suffered a concussion after falling from the bike.
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.
C2 verb /koʊˈæɡjəˌleɪt/

coagulate

Meaning
to cause a liquid, especially blood, to change into a solid or semi-solid state
Example
The blood quickly coagulated after the cut.
C2 noun /ˈkænə/

Canna

Meaning
a tropical flowering plant with large, colorful flowers and broad leaves
Example
The bright orange canna lilies grew tall beside the pond.
C1 noun /ˌkɒrəˈneɪʃən/

coronation

Meaning
the act or ceremony of crowning a sovereign or monarch
Example
The coronation of the new king was attended by thousands of people.
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.
C2 noun, verb /ˈkæŋkər/

canker

Meaning
A fungal disease of plants; an ulcerous sore in the mouth; to corrupt or destroy slowly
Example
The tree was infected with a canker that damaged its bark.
B2 noun /kənˈdʒʌŋkʃən/

conjunction

Meaning
a word used to connect clauses or sentences, or to coordinate words
Example
The words 'and' and 'but' are common conjunctions.
B1 verb /kənˈsʌlt/

consult

Meaning
To seek advice or information from someone with expertise.
Example
You should consult a doctor before starting the treatment.
C1 noun /kənˈvʌl.ʃən/

convulsion

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

corps

Meaning
a branch of the military or a group organized for a specific purpose
Example
He joined the army corps after graduation.
A2 noun /ˈkær.ɪk.tər/

Character

Meaning
the mental and moral qualities distinctive to an individual; a person in a novel, play, or film
Example
She showed great character by helping others during the crisis.
C1 adjective /ˈkɒz.mɪk/

cosmic

Meaning
relating to the universe or cosmos; vast
Example
Astronomers study cosmic phenomena to understand the universe.
B1 verb, noun /klɪp/

clip

Meaning
to cut or trim something; a short extract from a film, broadcast, or recording
Example
She clipped the coupon from the newspaper.
B1 noun kəˈmɪt.mənts

commitments

Meaning
Formal pledges or promises to do something, especially in terms of obligations or agreements.
Example
Global commitments to renewable energy are increasing.
B2 verb kənˈdem

condemn

Meaning
To express complete disapproval of; to censure.
Example
The leaders condemned the actions as inhumane.
B2 adjective /kənˈsɜːvətɪv/

conservative

Meaning
Favoring traditional views and values; resistant to change.
Example
He has conservative views on family and society.
C1 noun /koʊlt/

Colt

Meaning
a young male horse, especially one under four years old
Example
The farmer trained the young colt to accept a saddle.
B2 verb /kənˈsɜːrv/

conserve

Meaning
to protect something from harm or destruction; to use resources carefully to avoid waste
Example
We must conserve water during the dry season.
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 /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.
C2 noun /koʊˈædʒətər/

coadjutor

Meaning
a person who helps or assists another, especially in a religious or official capacity
Example
The bishop appointed a coadjutor to assist him with his duties.
A2 verb /kənˈteɪn/

contain

Meaning
to have or include within; to restrain or control
Example
This box contains important documents.
B2 noun /tʃʌŋk/

chunk

Meaning
a thick or solid piece of something
Example
She cut the cake into large chunks.
C2 adjective /kənˈdʌktəbl̩/

conductible

Meaning
capable of being conducted, especially electricity or heat
Example
Copper is highly conductible to electricity.
C1 adjective, noun /ˈkeɪnaɪn/

canine

Meaning
Relating to dogs; also refers to the pointed teeth in humans and animals
Example
The police trained a canine unit for search operations.
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.
C2 noun, adjective /klɛərˈvɔɪənt/

clairvoyant

Meaning
a person who claims to have clairvoyance; having the ability to see beyond normal senses
Example
The clairvoyant predicted that she would travel abroad soon.
A2 noun /ˈkændl/

candle

Meaning
a stick of wax with a wick that burns to give light
Example
She lit a candle during the power cut.
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.
C2 verb /kəˈmɪz.ə.reɪt/

commiserate

Meaning
To express sympathy or compassion for someone's misfortune.
Example
She called her friend to commiserate after his loss.
C1 noun /ˈkɒrənər/

coroner

Meaning
an official who investigates sudden, violent, or suspicious deaths
Example
The coroner determined the cause of death was natural.
C2 noun /kənˈsaɪnər/

consignor

Meaning
a person or company that sends goods to be sold or transported
Example
The consignor shipped the goods to the warehouse.
C2 noun /ˈtʃæt.əl/

chattel

Meaning
a personal possession; historically, movable property including slaves
Example
In the past, slaves were considered the chattel of their owners.
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 verb /kənˈkɒkt/

concoct

Meaning
to make something, especially food or a story, by mixing or inventing
Example
He concocted a story to explain his absence.
C1 noun /ˈkruːsɪbəl/

crucible

Meaning
a severe test or trial; a container used for heating substances to very high temperatures
Example
The team emerged stronger from the crucible of competition.
C2 adjective /kænˈtæŋ.kər.əs/

cantankerous

Meaning
Bad-tempered, argumentative, and uncooperative.
Example
The cantankerous old man complained about everything.
C2 noun /ˈkɔː.seər/

corsair

Meaning
a pirate, especially one operating along the Mediterranean coasts
Example
The corsair plundered ships along the coast.
B1 noun/verb /ˈkɒmplɪmənt/

compliment

Meaning
a polite expression of praise or admiration; to politely praise someone
Example
She complimented him on his excellent presentation.
C2 adjective /kɔːrˈpɔːriəl/

corporeal

Meaning
relating to the physical body; material or tangible
Example
Ghosts are often described as having no corporeal form.
C2 noun ˌsaɪ.bəˈnet.ɪks

cybernetics

Meaning
The science of communications and automatic control systems in both machines and living things.
Example
Cybernetics plays a crucial role in artificial intelligence.
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.
C2 noun /ˈtʃaɪ.nə roʊz/

China-rose

Meaning
a tropical flowering plant with large, showy flowers in various colors
Example
The bright red China-rose flowers decorated the entrance of the house.
C1 verb koʊˈɜrs

coerce

Meaning
To force someone to do something against their will using threats or intimidation.
Example
The manager tried to coerce the employees into working overtime.
C2 noun /kænˈtɑː.tə/

cantata

Meaning
A vocal composition with instrumental accompaniment, typically in several movements, often involving a choir.
Example
The choir performed a beautiful cantata during the festival.
C1 verb /kənˈtraɪv/

contrive

Meaning
to plan or devise cleverly or skillfully
Example
She contrived a clever plan to surprise her friends.
B1 noun /ˈkæmpəs/

campus

Meaning
The grounds and buildings of a university, college, or school.
Example
The university campus is filled with students during the fall semester.
C1 adjective /kɜːrt/

curt

Meaning
Rudely brief in speech or manner.
Example
His curt reply made everyone uncomfortable.
B2 noun /ˈkæp.tɪv/

Captive

Meaning
a person who has been taken prisoner or an animal that has been confined
Example
The captive was held in a small cell for several months.
C1 verb /tʃɑːr/

char

Meaning
To burn or scorch something so that it becomes blackened.
Example
The cook accidentally charred the steak.
B1 noun /ˈsɪtɪzən/

citizen

Meaning
a legally recognized subject or national of a state
Example
Every citizen has the right to vote.
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.
B1 noun /ˈsɛrəˌmoʊni/

ceremony

Meaning
A formal event or occasion, often with rituals and traditions.
Example
The graduation ceremony was held in the university hall.
A2 adjective /ˈkloʊ.sɪst/

closest

Meaning
nearest in distance or relationship
Example
He is my closest friend.
B2 adjective /ˈklɪn.ɪ.kəl/

clinical

Meaning
Related to the observation and treatment of patients rather than theoretical study.
Example
The doctor conducted a clinical examination.
C1 noun /klæn/

clan

Meaning
a large family group or a close-knit community with shared interests or ancestry
Example
The entire clan gathered to celebrate the festival.
B2 noun /kənˈdenst mɪlk/

Condensed milk

Meaning
milk from which water has been removed and sugar added, creating a thick, sweet product
Example
The recipe calls for a can of condensed milk to make the dessert extra creamy.
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.
B2 noun /kənˈstreɪnt/

constraint

Meaning
a limitation or restriction
Example
Time is the biggest constraint in completing the project.
B2 adjective /ˈkɒnʃəs/

conscious

Meaning
Aware of and responding to one's surroundings; awake.
Example
She was fully conscious after the surgery.
A2 noun /ˈkʌm.pə.ni/

company

Meaning
a business organization; the presence of other people
Example
She started her own company to sell handmade products.
B1 verb /kəˈmænd/

command

Meaning
to give an order authoritatively; to control or direct
Example
The general commanded the soldiers to move forward.
A2 adjective /ˈkʌlərfəl/

colorful

Meaning
having bright colors; full of variety or interest
Example
The festival was full of colorful decorations.