Origin: 1200–50;Middle Englishplaiden < Old Frenchplaid(i)er to go to law, plead < early Medieval Latinplacitāre to litigate, derivative of Latinplacitum opinion. See plea
mid-13c., "make a plea in court," from Anglo-Fr. pleder, O.Fr. pleider, plaidier, "agreement, discussion, lawsuit," from M.L. placitare, from L.L. placitum (see plea). Sense of "request, beg" first recorded late 14c.