Canon

noun

1. A generally accepted principle; a rule.

   "The trial must proceed according to the canons of law."

2. A group of literary works that are generally accepted as representing a field.
3. The works of a writer that have been accepted as authentic.

   "the entire Shakespeare canon"

4. A eucharistic prayer, particularly the Roman Canon.
5. A religious law or body of law decreed by the church.

   "We must proceed according to canon law."