| concubinage | (noun) cohabitation without being legally married | - |
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| concubine | (noun) a woman who cohabits with an important man | Synonyms: courtesan, doxy, paramour |
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| concupiscence | (noun) a desire for sexual intimacy | Synonyms: eros, physical attraction, sexual desire |
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| concupiscent | (adjective) vigorously passionate | Synonyms: lustful, lusty |
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| concur | (verb) happen simultaneously | Synonyms: coincide |
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| (verb) be in accord; be in agreement | Synonyms: agree, concord, hold |
| concurrence | (noun) acting together, as agents or circumstances or events | Synonyms: concurrency |
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| (noun) the temporal property of two things happening at the same time | Synonyms: co-occurrence, coincidence, conjunction |
| (noun) agreement of results or opinions | Synonyms: concurrency |
| (noun) a state of cooperation | Synonyms: meeting of minds |
| concurrency | (noun) acting together, as agents or circumstances or events | Synonyms: concurrence |
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| (noun) agreement of results or opinions | Synonyms: concurrence |
| concurrent | (adjective) occurring or operating at the same time | Synonyms: co-occurrent, coincident, coincidental, coinciding, cooccurring, simultaneous |
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| concurrently | (adverb) overlapping in duration | Synonyms: at the same time |
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| concurring | (adjective) being of the same opinion | Synonyms: concordant |
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| concuss | (verb) injure the brain; sustain a concussion | - |
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| (verb) shake violently | - |
| concussion | (noun) injury to the brain caused by a blow; usually resulting in loss of consciousness | - |
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| (noun) any violent blow | - |