one of a body of dignitaries or prebendaries attached to a cathedral or a collegiate church; a member of the chapter of a cathedral or a collegiate church.
2.
Roman Catholic Church. one of the members (canons regular) of certain religious orders.
Origin: 1150–1200; Middle English; back formation from Old English canōnic (one) under rule < Medieval Latin canōnicus,Latin: of or under rule < Greek kanōnikós.See canon1, -ic
"clergyman," c.1200, from Anglo-Fr. canun, from O.N.Fr. canonie, from L.L. canonicus "clergyman living under a rule," from L. canonicus (adj.) "according to rule," from Gk. kanonikos, from kanon (see canon (1)).