noun

1. a statement in defense or justification; excuse
2. an earnest and urgent request; appeal; entreaty
3. Law
   1. a pleading or allegation, now, esp., in a civil action
   2. the response of a defendant to criminal charges a plea of not guilty

Etymology: ME plai < OFr plaid, suit, plea < L placitum, opinion, order, orig. that which is pleasing, orig. neut. pp. of placere, to please