| coeducate | (verb) educate persons of both sexes together | Synonyms: co-educate |
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| coeducation | (noun) education of men and women in the same institutions | - |
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| coeducational | (adjective) attended by members of both sexes | Synonyms: co-ed |
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| coefficient | (noun) a constant number that serves as a measure of some property or characteristic | - |
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| coelacanth | (noun) fish thought to have been extinct since the Cretaceous period but found in 1938 off the coast of Africa | Synonyms: Latimeria chalumnae |
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| coelenterate | (noun) radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms | Synonyms: cnidarian |
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| coelenteron | (noun) the saclike body cavity of a coelenterate | - |
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| coeliac | (adjective) of or in or belonging to the cavity of the abdomen | Synonyms: celiac |
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| coelogyne | (noun) any of various orchids of the genus Coelogyne with: clusters of fragrant lacy snow-white flowers; salmon-pink solitary flowers; chainlike racemes of topaz and chocolate brown flowers; spikes of delicate white spice-scented flowers; emerald green flowers marked with blue-black | - |
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| coelom | (noun) a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity | Synonyms: celom, celoma |
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| coelophysis | (noun) one of the oldest known dinosaurs; late Triassic; cannibalistic | - |
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| coelostat | (noun) optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror | - |
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| coenobite | (noun) a member of a religious order living in common | Synonyms: cenobite |
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| coenobitic | (adjective) of or relating to or befitting cenobites or their practices of communal living | Synonyms: cenobitic, cenobitical, coenobitical |
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| coenobitical | (adjective) of or relating to or befitting cenobites or their practices of communal living | Synonyms: cenobitic, cenobitical, coenobitic |
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| coenzyme | (noun) a small molecule (not a protein but sometimes a vitamin) essential for the activity of some enzymes | - |
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| coequal | (adjective) having the same standing before the law | - |
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| coerce | (verb) to cause to do through pressure or necessity, by physical, moral or intellectual means | Synonyms: force, hale, pressure, squeeze |
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| coercion | (noun) using force to cause something to occur | Synonyms: compulsion |
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| (noun) the act of compelling by force of authority | - |
| coercive | (adjective) serving or intended to coerce | - |
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| coetaneous | (adjective) of the same period | Synonyms: coeval, contemporaneous |
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| coeval | (adjective) of the same period | Synonyms: coetaneous, contemporaneous |
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| (noun) a person of nearly the same age as another | Synonyms: contemporary |
| coevals | (noun) all the people living at the same time or of approximately the same age | Synonyms: contemporaries, generation |
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| coexist | (verb) exist together | Synonyms: cohabit |
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| (verb) coexist peacefully, as of nations | - |
| coexistence | (noun) existing peacefully together | - |
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| coexistent | (adjective) existing at the same time | Synonyms: coexisting |
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| coexisting | (adjective) existing at the same time | Synonyms: coexistent |
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| coextension | (noun) equality of extension or duration | - |
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| coextensive | (adjective) being of equal extent or scope or duration | Synonyms: conterminous, coterminous |
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