MISTRESS Copy link • MISTRESSThe female head of a family, materfamilias (opposed to concubina): hera (opposed to the servants; also, hera major; opposed to hera minor, i. e., a daughter of the master of the house; Vid: Plaut., Truc., 4, 3, 22): domina (lady of the house, so called by the master, or by the servants, by way of respect). A concubine, concubina; pellex (= quae uxorem habenti nubit): amica: to keep a mistress, feminam habere in concubinatu (Ulp.): to be a mistress, in concubinatu esse (Ulp.).