Source : Webster's Revised Unabridged Dictionary (1913)

Suasion \Sua"sion\, n. [L. suasio, fr. suadere, suasum, to
   advise, persuade, fr. suadus persuading, persuasive; akin to
   suavis sweet: cf. OF. suasion. See {Suave}, and cf.
   {Dissuade}, {Persuade}.]
   The act of persuading; persuasion; as, moral suasion.

Source : WordNet®

suasion
     n : the act of persuading (or attempting to persuade);
         communication intended to induce belief or action [syn: {persuasion}]