I.to make calm or still, to calm, still.
I. Lit. (very rare; “syn. sereno): mare tranquillatur oleo,” Plin. 2, 103, 106, § 234. —
B. Transf.: “vultum,” i. e. to clear up, brighten, Plaut. Capt. 1, 2, 21.—
II. Trop., to calm, compose, tranquillize (class.): “ut aut perturbentur animi aut tranquillentur,” Cic. Top. 26, 98: “animos,” id. Fin. 1, 16, 50: “tranquillatis rebus Romanis,” Nep. Att. 4, 5: “quid pure tranquillet, honos an dulce lucellum,” Hor. Ep. 1, 18, 102.