Lewis & Short

ēlŏquentĭa, ae, f. [eloquor], a being eloquent, eloquence, Cic. Part. 23, 79; id. de Or. 1, 5, 19; 1, 32, 146; Quint. 9, 17, 2; 2, 16, 7; Tac. Or. 8, 30 et saep.