1520s, "a holding off, refusal to do something," from French abstention (Old French astencion), from Late Latin abstentionem (nominative abstentio) "the act of retaining," noun of action from past-participle stem of Latin abstinere/abstenere "withhold, keep back, keep off," from assimilated form of ab "off, away from" (see ab-) + tenere "to hold" (from PIE root *ten- "to stretch"). As "a refraining from voting" by 1880.
