antŏnŏmăsĭa, ae, f., = ἀντονομασία,
a rhetorical figure , by which , instead of the name , an epithet of a person is employed (e. g. instead of Scipio, Eversor Carthaginis; instead of Achilles, Pelides; instead of Juno, Saturnia, etc.), Quint. 8, 6, 29; 8, 6, 43.
·noun The use of some epithet or the name of some office, dignity, or the like, instead of the prope...
Webster's Dictionary of the English Language