Meaning of canonical

ca•non•i•cal

1. pertaining to, established by, or conforming to a canon or canons.
2. included in the canon of the Bible.
3. authorized; recognized; accepted: canonical works.
4. (of an equation, coordinate, etc.) in simplest or standard form.
5. following the pattern of a musical canon.
6. (of a form or pattern) characteristic, general or basic: the canonical form of the past tense; a canonical syllable pattern.

1. garments prescribed by canon law for clergy when officiating.