canon (Noun) — A rule, or especially a body of rules, or principles generally established as valid and fundamental in a field of art or philosophy. ex. "the neoclassical canon" ex. "canons of polite society"
canon (Noun) — A priest who is a member of a cathedral chapter.
canon (Noun) — A ravine formed by a river in an area with little rainfall.
canon (Noun) — A contrapuntal piece of music in which a melody in one part is imitated exactly in other parts.
canon (Noun) — A complete list of saints that have been recognized by the Roman Catholic Church.
canon (Noun) — A collection of books accepted as holy scripture especially the books of the Bible recognized by any Christian church as genuine and inspired.