Nouns

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