canon >> /ˈkænən/
Definition: [noun] A general law, rule, principle, or criterion by which something is judged.
Example: the appointment violated the canons of fair play and equal opportunity
Definition: [noun] A collection or list of sacred books accepted as genuine.
Example: the formation of the biblical canon
Definition: [noun] (in the Roman Catholic Church) the part of the Mass containing the words of consecration.
Example: Do you accept the presider's invitation to join him in the sanctuary for the canon of the Mass?
Definition: [noun] A piece in which the same melody is begun in different parts successively, so that the imitations overlap.
Example: the very simple rhythmic structure of this double canon