suāvĭlŏquentĭa, ae, f. [suaviloquens],
sweetness of speech , suaviloquence : et oratorem appellat (Ennius Cethegum) et suaviloquentiam tribuit, Cic. Brut. 15, 58; cf. suaviloquens.
suāviloquentia ae, f suaviloquens, sweetness of speech, agreeableness . ...
An Elementary Latin Dictionary