Lewis & Short

in-dīvĭdŭus, a, um, adj. [2. in-divido].

  1. I. Lit., not divided, indivisible (class.): arbores, with stems not branched, Plin. 16, 30, 53, § 122: ille atomos, quas appellat, id est, corpora individua, Cic. Fin. 1, 6, 17: nihil esse individuum potest, id. N. D. 1, 23, 65: corpuscula, Amm. 26, 1, 1.
    Hence, subst.: indīvĭdŭum, i, n., an atom, indivisible particle: ex illis individuis, unde omnia Democritus gigni affirmat, Cic. Ac. 2, 17 fin.: ne individuum quidem, nec quod dirimi distrahive non possit, id. N. D. 3, 12, 29.
  2. II. Trop., inseparable, not separated (postAug.): comitatus virtutum, Sen. Ep. 67 med.: contubernium, App. M. 4, p. 154, 16: Rhodum secuti et apud Capreas individui, Tac. A. 6, 10: pietas, undivided, impartial, Ps.Quint. Decl. 5, 3.