alternation Copy link Outline 1. vĭcissĭtūdo2. vĭcis (gen. • alternation: 1. vĭcissĭtūdo: the a.s of days and nights, dierum noctiumque vicissitudines, Cic.: the a.s of fortunes, v. fortunae, Cic. 2. vĭcis (gen.: nom. sing. not found), f.: the a.s of questioning oneself and of replying to oneself are usually not unpleasant, et interrogandi se ipsum et respondendi sibi solent esse non ingratae v., Quint.: by a., in vicem: v. alternately.