Colloquial/kəˈləʊkwiəl/ Definition 1 of 1Pro Tip 1/3Everyday Speech Colloquial terms are often region-specific, used in casual chat. The colloquialisms he used revealed he was from Texas. Pro Tip 2/3Not for Formal Use Avoid colloquial language in formal writing or speeches, like essays or presentations. His colloquial wording was frowned upon in the academic paper. Pro Tip 3/3Cultural Nuances Colloquialisms can carry meanings unique to a culture that may not translate well. Her colloquial jokes didn't make sense to the foreign audience.