Lewis & Short

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fĕrōcĭa, ae, f. [ferox], a wild or untamed spirit, fierceness, in a good or bad sense (class.).

  1. I. In a good sense, spirit, courage, bravery: infirmitas puerorum et ferocitas juvenum et gravitas jam constantis aetatis et senectutis maturitas naturale quiddam habet, Cic. de Sen. 10, 33: Romana virtus et ferocia, Liv. 9, 6 fin.: ferociam animi in vultu retinens, Sall. C. 61, 4: si quid ardoris ac ferociae miles habuit, Tac. H. 2, 76 fin.: plus tamen ferociae Britanni praeferunt, ut quos nondum longa pax emollierit, id. Agr. 11 fin.; cf.: virtus ac ferocia, id. ib. 31: ardor ac ferocia, id. H. 2, 76: ferociā verborum militem incendebat, id. ib. 4, 71.
  2. II. In a bad sense, savageness, ferocity.
    1. A. Prop.: ferocitate atque ferocia, Pac. ap. Non. 490, 19: qui comperit ejus vim et effrenatam illam ferociam, Cic. Fragm. ap. Non. 492, 3 (Rep. 5, 8 ed. Mos.): arrogans atque intoleranda ferocia, id. Agr. 2, 33, 91; 2, 35, 96: per communes liberos oravit exueret ferociam, Tac. A. 2, 72: ingeniorum, Vell. 2, 115, 3: stolida mentis, Ov. Hal. 58.
    2. B. Transf., of wine, harshness, roughness: vini, Plin. 14, 19, 24, § 121.

fĕrōcĭo, īvi or ĭi, 4, v. n. [ferox], to be fierce, unruly, ungovernable; to rage, be furious: Ferocio, ἀγριαίνομαι, Gloss. Labb. (perh. only ante- and post-class.; for in Quint. 10, 3, 10, ferocientes equos is, acc. to the MSS., to be read efferentis se equos): ferocit apud Catonem ferociter agit, Paul. ex Fest. p. 92, 7 Müll.: si permulcti sonis mitioribus non immodice ferocirent, Gell. 1, 11, 2: oratio ferociens saeviensque, id. ib. § 15: in aliquam sectam, Tert. Apol. 5: ferociens, Amm. 14, 9, 9.