"annulling of (a law) by legislative action," 1530s, from Latin abrogationem (nominative abrogatio) "a repeal (of a law)," noun of action from past-participle stem of abrogare "annul, repeal," from ab "off, away from" (see ab-) + rogare "propose (a law), ask, request," apparently a figurative use of a PIE verb meaning literally "to stretch out (the hand)," from root *reg- "move in a straight line."
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