| cacogenesis | (noun) inability to produce hybrids that are both viable and fertile | - |
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| cacogenics | (noun) the study of the operation of factors causing degeneration in the type of offspring produced | Synonyms: dysgenics |
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| cacography | (noun) poor handwriting | Synonyms: scratch, scrawl, scribble |
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| cog | (noun) tooth on the rim of gear wheel | Synonyms: sprocket |
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| (noun) a subordinate who performs an important but routine function | - |
| cogency | (noun) the quality of being valid and rigorous | Synonyms: rigor, rigour, validity |
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| (noun) persuasive relevance | - |
| cogitation | (noun) attentive consideration and meditation | Synonyms: study |
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| (noun) a carefully considered thought about something | - |
| cognate | (noun) a word is cognate with another if both derive from the same word in an ancestral language | Synonyms: cognate word |
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| (noun) one related by blood or origin; especially on sharing an ancestor with another | Synonyms: blood relation, blood relative, sib |
| cognation | (noun) (anthropology) the condition of being related by blood | Synonyms: blood kinship, consanguinity |
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| (noun) line of descent traced through the maternal side of the family | Synonyms: enation, matrilineage |
| cognisance | (noun) having knowledge of | Synonyms: awareness, cognizance, consciousness, knowingness |
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| cognition | (noun) the psychological result of perception and learning and reasoning | Synonyms: knowledge, noesis |
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| cognizance | (noun) having knowledge of | Synonyms: awareness, cognisance, consciousness, knowingness |
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| (noun) range of what one can know or understand | Synonyms: ken |
| (noun) range or scope of what is perceived | - |
| cognomen | (noun) the name used to identify the members of a family (as distinguished from each member's given name) | Synonyms: family name, last name, surname |
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| (noun) a familiar name for a person (often a shortened version of a person's given name) | Synonyms: byname, moniker, nickname, sobriquet, soubriquet |
| cognoscente | (noun) an expert able to appreciate a field; especially in the fine arts | Synonyms: connoisseur |
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| cogwheel | (noun) a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion | Synonyms: gear, gear wheel, geared wheel |
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| discography | (noun) a descriptive catalog of musical recordings | - |
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| excogitation | (noun) thinking something out with care in order to achieve complete understanding of it | - |
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| (noun) the creation of something in the mind | Synonyms: conception, design, innovation, invention |
| excogitator | (noun) a thinker who considers carefully and thoroughly | - |
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| glycogen | (noun) one form in which body fuel is stored; stored primarily in the liver and broken down into glucose when needed by the body | Synonyms: animal starch |
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| glycogenesis | (noun) the conversion of glucose to glycogen when the glucose in the blood exceeds the demand | - |
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| (noun) the formation in animals of glycogen from glucose | - |
| incognizance | (noun) a lack of knowledge or recognition | - |
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| lexicographer | (noun) a compiler or writer of a dictionary; a student of the lexical component of language | Synonyms: lexicologist |
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| lexicography | (noun) the act of writing dictionaries | - |
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| oncogene | (noun) a gene that disposes normal cells to change into cancerous tumor cells | Synonyms: transforming gene |
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| pharmacogenetics | (noun) the branch of genetics that studies the genetically determined variations in responses to drugs in humans or laboratory organisms | - |
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| precognition | (noun) knowledge of an event before it occurs | Synonyms: foreknowledge |
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| recognisance | (noun) (law) a security entered into before a court with a condition to perform some act required by law; on failure to perform that act a sum is forfeited | Synonyms: recognizance |
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| recognition | (noun) designation by the chair granting a person the right to speak in a deliberative body | - |
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| (noun) the process of recognizing something or someone by remembering | Synonyms: identification |
| (noun) an acceptance (as of a claim) as true and valid | - |
| (noun) coming to understand something clearly and distinctly | Synonyms: realisation, realization |
| (noun) approval | Synonyms: credit |
| (noun) the explicit and formal acknowledgement of a government or of the national independence of a country | - |
| (noun) (biology) the ability of one molecule to attach to another molecule that has a complementary shape | - |
| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgement, acknowledgment |
| recognizance | (noun) (law) a security entered into before a court with a condition to perform some act required by law; on failure to perform that act a sum is forfeited | Synonyms: recognisance |
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| toxicognath | (noun) either of a pair of poison fangs in the modified front pair of legs of the centipede | - |
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