late 15c., from Old French affabilité (14c.), noun of quality from affable (see affable).
late 15c., from Old French afable (14c.), from Latin affabilis "approachable, courteous, kind, friendly," literally "who can be (easily) spoken to," from affari "to speak to," from ad- "to" (see ad-) + fari "to speak" (see fame (n.)). Related: Affably.