Lewis & Short

căpĭtātĭo, ōnis, f. [caput];

  1. I. in the Lat. of jurists, a poll-tax, Dig. 50, 15, 3; 50, 4, 18 fin.; Amm. 17, 3, 2 (ap. Cic. Fam. 3, 8, 5: exactio capitum).
  2. II. The outlay of the state for beasts used in the public service, Cod. Th. 7, 4, 8; 7, 4, 11.