01 a. Pertaining to, or used in, conversation, esp. common and familiar conversation; conversational; hence, unstudied; informal; as, colloquial …
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Pertaining to, or used in, conversation, esp. common and familiar conversation; conversational; hence, unstudied; informal; as, colloquial intercourse; colloquial phrases; a colloquial style.“His [Johnson's] colloquial talents were, indeed, of the highest order.” — Macaulay.