Etymology
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suasion (n.)

late 14c., from Old French suasion (14c.) and directly from Latin suasionem (nominative suasio) "a recommending, advocacy, support," noun of action from past participle stem of suadere "to urge, incite, promote, advise, persuade," literally "recommend as good" (related to suavis "sweet"), from PIE root *swād- "sweet, pleasant" (see sweet (adj.)). Survives chiefly in phrase moral suasion (1640s). Latin Suada was the goddess of persuasion.

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Definitions of suasion

suasion (n.)
the act of persuading (or attempting to persuade); communication intended to induce belief or action;
Synonyms: persuasion
From wordnet.princeton.edu