Etymology: Middle English, from Old English, from Late Latin, from Latin, ruler, rule, model, standard, from Greek kanōn
Date: before 12th century
1 a: a regulation or dogma decreed by a church council b: a provision of canon law 2[Middle English, from Anglo-French, from Late Latin, from Latin, model]: the most solemn and unvarying part of the Mass including the consecration of the bread and wine 3[Middle English, from Late Latin, from Latin, standard]a: an authoritative list of books accepted as Holy Scripture b: the authentic works of a writer c: a sanctioned or accepted group or body of related works <the canon of great literature> 4 a: an accepted principle or rule b: a criterion or standard of judgment c: a body of principles, rules, standards, or norms 5[Late Greek kanōn, from Greek, model]: a contrapuntal musical composition in which each successively entering voice presents the initial theme usually transformed in a strictly consistent way