Lewis & Short

mītĭfĭco, āvi, ātum, 1, v. a. [mitis-facio], to make mild or mellow, to mature, ripen; to make tame, to tame (mostly postAug. for the class. mitigo, q. v.).

  1. I. Lit.: in omne corpus diviso et mitigato cibo, well digested, distributed as nutriment (al. modificatus), Cic. Div. 2, 26, 57 Orell. N. cr.: nocte sidus tepido fulgore mitificat (marinas locustas), Plin. 9, 31, 50, § 96: elephantos, to tame, id. 8, 7, 7, § 23.
  2. II. Trop., to make mild or gentle: homines, Gell. 2, 12, 4.