concentration, n. centralization, [consolidation]; condensation.
concept, n. [conception], [notion], [idea].
conception, n. ideation, [imagination]; [idea], [concept], [notion], impression.
concern, n. [business], affair; [moment], [importance], [interest], [weight], [consequence]; solicitude, [anxiety], uneasiness [care]; [firm], [house], [company], [partnership]. Antonyms: [unconcern], inconsequence.
concerned, a. solicitous, worried, [anxious], [apprehensive], troubled, [uneasy]. Antonyms: [unconcerned], [indifferent].
concerning, prep. regarding, [about], respecting, [touching], with reference to.
concert, n. [accordance], concurrence, [harmony]; musicale.
concise, a. epigrammatic, [sententious], succinct, laconic, [pithy]. Antonyms: [diffuse], prolix.
conclude, v. [decide], determine, [resolve]; [end], [close]; [infer], deduce; [effect], [arrange].
conclusion, n. [decision], determination; [inference], [deduction], corollary, illation; [close], [end], peroration, finale, [completion], dénouement, l'envoy.