the act of advising, urging, or attempting to persuade; persuasion.
2.
an instance of this; a persuasive effort.
Origin: 1325–75; ME < L suāsiōn- (s. of suāsiō), equiv. to suās(us), ptp. of suādēre to advise (suād-, verb s. + -tus ptp. suffix, with dt > s) + -iōn--ion
1374, probably via O.Fr. suasion (14c.), from L. suasionem (nom. suasio) "an advising, a counseling," from suasus, pp. of suadere "to urge, persuade" (related to suavis "sweet;" see sweet). Survives chiefly in phrase moral suasion (1642).