Tranquil \Tran"quil\, a. [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.
   
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         A style clear, tranquil, easy to follow. --De Quincey.
   
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 Tranquilization