| Word | Definition |
| Conglomeration | a cohering mass |
| Congruence | state of corresponding; harmonious relationship |
| Congruent | in agreement; corresponding |
| Conifer | pine tree; cone-bearing tree |
| Conjecture | surmise; guess; speculate |
| Conjugal | pertaining to marriage |
| Conjure | to summon a devil; to practice magic; to imagine or to invent |
| Connivance | pretense of ignorance of something wrong; assistance; permission to offend |
| Connoisseur | person competent to act as a judge of art; a lover or an art |
| Connotation | suggested or implied meaning of an expression |
| Connubial | pertaining to marriage or the matrimonial state: Conjugal |
| Consanguinity | kinship |
| Conscientious | governed by conscience:scrupulous; careful |
| Conscript | draftee; person forced into military service |
| Consecrate | to dedicate; to sanctify |
| Consensus | general agreement |
| Consequential | pompous; self-importance |
| Conservatory | school of fine arts (i.e. music/drama) |
| Consign | to deliver officially; to entrust; to set apart |
| Consistency | absence of contradictions; dependability; uniformity; degree of thickness |
| Console | to lessen sadness or disappointment; to give comfort |
| Consolidation | unification; process of becoming firmer or stronger |
| Consonance | harmony; agreement |
| Consort | to associate with |
| Consort | husband or wife |
| Conspiracy | treacherous plot |
| Constituent | supporter |
| Constraint | compulsion; repression of feelings |
| Construe | to explain; to interpret |
| Consummate | complete |
| Contagion | infection |
| Contaminate | to pollute |
| Contempt | scorn; disdain |
| Contend | to struggle; to compete; to assert earnestly |
| Contention | an act of struggling; a claim |
| Contentious | quarrelsome |
| Contest | to dispute |
| Context | writings preceding and following the passage quoted; environment or setting |
| Contiguous | adjacent to; touching upon |
| Continence | self-restraint; sexual chastity |
| Contingent | dependent on; conditional |
| Contingent | delegation |
| Contortions | twistings; distortions |
| Contraband | illegal trade; smuggling; smuggled goods |
| Contravene | to contradict; to oppose |
| Contrite | feeling or showing sorrow and remorse |
| Contrived | planned; forced; artificial; not spontaneous |
| Controvert | to oppose with arguments; to attempt to refute |
| Contumacious | disobedient; resisting authority |
| Contusion | bruise |
| Conundrum | riddle; difficult problem |
| Convene | to assemble |
| Convention | social or moral custom; established practice |
| Converge | to approach; to tend to meet; to come together |
| Conversant | familiar with |
| Converse | opposite |
| Convert | one who adopts different religion/opinion |
| Convex | curving outward |
| Conveyance | vehicle; transfer |
| Conviction | judgment that someone is guilty of a crime; strongly held belief |
| Convivial | friendly; agreeable; fond of feasting/good company |
| Convoke | to call together |
| Convoluted | involved; intricate; coiled around |
| Copious | plentiful; full of thought |
| Coquette | a flirt |
| Cordial | gracious; heartfelt |
| Cordon | extended line of men or fortifications to prevent access or egress |
| Cornice | projecting molding on building |
| Cornucopia | horn overflowing with fruit an grain; symbol of abundance |
| Corollary | consequence; accompaniment |
| Corporeal | bodily; material |
| Corpulent | very fat |
| Correlation | mutual relationship |
| Corroborate | to confirm; to support |
| Corrode | to destroy by chemical action |
| Corrosive | eating away by chemicals or disease |
| Corrugated | ridged; wrinkled |
| Cosmic | pertaining to the universe; vast |
| Coterie | exclusive group; group that meets socially |
| Countenance | to approve; to tolerate |
| Countenance | face |
| Countermand | to cancel; to revoke |
