1. (noun)canon a rule or especially body of rules or principles generally established as valid and fundamental in a field or art or philosophy "the neoclassical canon"; "canons of polite society"
4. (noun)canon a contrapuntal piece of music in which a melody in one part is imitated exactly in other parts
5. (noun)canon a complete list of saints that have been recognized by the RomanCatholic Church
6. (noun)canon a collection of books accepted as holy scripture especially the books of the Bible recognized by any Christian church as genuine and inspired