Lewis & Short

collectīvus (conl-), a, um, adj. [colligo].

  1. * I. Collected, gathered together: umor, Sen. Q. N. 3, 7, 3.
  2. II. Trop.
    1. A. In the rehet. lang. of Quint., pertaining to a syllogism, syllogistic, ratiocinatire: status, Quint. 3, 6, 46; 3, 6, 66: quaestio, id. 7, 1, 60.
    2. B. In the lang. of grammar: nomen, a collective noun; as exercitus, populus, etc., Prisc. p. 581 P. al.