1. (O. Law) An amercement. Burrill. [ 1913 Webster ]
2. (Anc. Armor.) A thin-bladed dagger; so called, in the Middle Ages, because used to give the death wound or “mercy” stroke to a fallen adversary. [ 1913 Webster ]
3. (Eccl.) An indulgence as to food or dress granted to a member of a religious order. Shipley. [ 1913 Webster ]