GNU Collaborative International Dictionary of English

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  1.       

    Placid , a. [L. placidus, originally, pleasing, mild, from placere to please: cf. F. placide. See Please.] Pleased; contented; unruffied; undisturbed; serene; peaceful; tranquil; quiet; gentle. “That placid aspect and meek regard.” Milton. “Sleeping . . . the placid sleep of infancy.”  
    Macaulay.

    1913 Webster

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