Definition of "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

noun: a complete list of saints that have been recognized by the Roman Catholic Church

noun: a rule or especially body of rules or principles generally established as valid and fundamental in a field of art or philosophy

"The neoclassical canon."

noun: a contrapuntal piece of music in which a melody in one part is imitated exactly in other parts

noun: a ravine formed by a river in an area with little rainfall

noun: a priest who is a member of a cathedral chapter