Lewis & Short

suāsĭo, ōnis, f. [suadeo], a counselling, advice, exhortation, suasion, persuasion.

  1. I. In gen., Sen. Ep. 95, 65.
    Plur.: omni suasionum admonitionumque genere utens, Gell. 10, 19, 4.
  2. II. In partic.
    1. A. In publicists’ lang., a recommending, advocacy of a proposed law: suasio legis Serviliae, Cic. Clu. 51, 140.
    2. B. In rhetoric, the suasory species of eloquence, Cic. Or. 11, 37: praecepta dare de suasionibus, id. de Or. 2, 81, 333.