tranquila.[L. tranquillus; probably fr. trans across, over + a word akin to quietus quiet: cf. F. tranquille. See Quiet.] Quiet; calm; undisturbed; peaceful; not agitated; as, the atmosphere is tranquil; the condition of the country is tranquil.()A style clear, tranquil, easy to follow. (De Quincey.)n. The act of tranquilizing, or the state of being tranquilized.()v. t.[Cf. F. tranquilliser.] To render tranquil; to allay when agitated; to compose; to make calm and peaceful; as, to tranquilize a state disturbed by factions or civil commotions; to tranquilize the mind.()()n. One who, or that which, tranquilizes.()a. Making tranquil; calming.()