1530s, "a pause, a delay" (a sense now obsolete); 1540 as legal pleading to the effect that, even conceding the facts to be as alleged by the opponent, he is not entitled to legal relief, from Anglo-French demurrer, Old French demorer "to delay, retard," from Latin demorari "to linger, loiter, tarry," from de- (see de-) + morari "to delay," from mora "a pause, delay" (see moratorium). Transferred sense of "objection raised or exception taken" to anything is by 1590s.