instalment Copy link Outline I. InstallationII. A payment in part1. pensio2. portio (a portion) • instalment: I. Installation: q. v. II. A payment in part: 1. pensio: to pay 300 talents in six annual i.s, trecenta talenta per annos sex p. aequis dare, Liv. 38, 9, med.: the first i., prima p., Cic. Fam. 6, 18, fin. 2. portio (a portion): the balance to be paid in three yearly i.s, ut id quod superesset triennio tribus p. persolveretur, Liv. 6, 35, med.