1A person who administers justice. Now chiefly historical. A ruler or governor invested with judicial authority.
2A judge of a superior court; = "justice".
3Generally. A judge, a magistrate; = "justice".
4 literary A person or (occasionally) thing which maintains or executes justice. Compare "justiciar", "justiciary".
5 rare A person who passes critical judgement; a censurer, a critic.
Late Middle English; earliest use found in Robert Mannyng (d. c1338), poet and historian. Originally (i) from Anglo-Norman justicer, justicere, justiser, justisere, Anglo-Norman and Middle French justicier (French justicier) person who maintains or executes justice, person who administers justice, ruler, governor from justice, justise + Anglo-Norman -er, Anglo-Norman and Old French -ier.