Definitions 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 or art or philosophy

  Example: "The neoclassical canon"

• noun:   a contrapuntal piece of music in which a melody in one part is imitated exactly in other parts
• noun:   a priest who is a member of a cathedral chapter
• noun:   a ravine formed by a river in an area with little rainfall
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #8214)