1.
An ecclesiastical law or code of laws established by a church council.
2.
A secular law, rule, or code of law.
3.
a. An established principle: the canons of polite society. b. A basis for judgment; a standard or criterion.
4. The books of the Bible officially accepted as Holy Scripture.
5. The works of a writer that have been accepted as authentic: the entire Sherlock Holmes canon.
6. Canon The part of the Mass beginning after the Preface and Sanctus and ending just before the Lord's Prayer.
7. The calendar of saints accepted by the Roman Catholic Church.
8. Music. A composition or passage in which the same melody is repeated by one or more voices, overlapping in time in the same or a related key.