interior (adj.) Copy link Outline 1. intĕrior, us2. internus • interior (adj.): 1. intĕrior, us: i. nations (living in the interior), i. nationes, Cic. Man. 22, 64. Neut. pl. used absol.: the i. parts of a kingdom, interiora regni, Liv. 42, 39, init. 2. internus: v. internal.