| 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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