a. [f. L. colloqui-um COLLOQUY + -AL.]

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  1.  Of or pertaining to colloquy; conversational.

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1751.  Johnson, Rambler, No. 101, ¶ 2. The colloquial wit has always his own radiance reflected on himself.

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1839.  De Quincey, Recoll. Lakes, Wks. 1862, II. 232. His … colloquial judgments upon doubtful actions of his neighbours.

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1871.  R. Ellis, Catullus, x. 6. We fell on endless themes colloquial.

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  2.  spec. Of words, phrases, etc.: Belonging to common speech; characteristic of or proper to ordinary conversation, as distinguished from formal or elevated language. (The usual sense.)

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1752.  Johnson, Rambler, No. 203, ¶ 11. To refine our language to grammatical purity, and to clear it from colloquial barbarisms.

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1817.  Coleridge, Biog. Lit., 218. To use a colloquial phrase, such sentiments … do one’s heart good.

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1876.  Green, Short Hist., vii. 418. The abandonment of … poetic diction for the colloquial language of real life.

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