Lewis & Short

pensĭo, ōnis, f. [pendo; lit., a weighing, weighing out; hence],

  1. I. A weight (only in Vitr.), Vitr. 10, 16; 10, 8.
  2. II. Transf., a paying, payment, a term of payment (class.; cf.: stipendium, pretium): pendere poenas solvere significat, ab eo, quod aere gravi cum uterentur Romani, penso eo, non numerato debitum solvebant: unde etiam pensiones dictae, Paul. ex Fest. p. 208 Müll.: nihil debetur ei, nisi ex tertiā pensione, Cic. Att. 16, 2, 1: prima, id. Fam. 6, 18, 5: altera tributi, Plin. 16, 8, 12, § 32.
    Transf., sarcastically: etenim ista tua minime avara conjux, nimium debet diu populo Romano tertiam pensionem, i. e. her third marriage (after your death), Cic. Phil. 2, 44, 113.
    1. B. In partic.
      1. 1. A tax, impost (post-class.), Aur. Vict. Caes. 39: vectigalium, id. Epit. 9.
      2. 2. Rent of a house or land (post-Aug.): aedium pensio annua, Suet. Ner. 44; Juv. 9, 63; Dig. 33, 7, 18.
      3. 3. Interest of money (post-class.), Lampr. Alex. Sev. 26.
      4. 4. Compensation: jacturae, Petr. 136, 2.