1.Definition: appearing in a biblical canon

"A canonical book of the Christian New Testament"

Related Adjective(s):canonic

2.Definition: conforming to orthodox or recognized rules

"The drinking of cocktails was as canonical a rite as the mixing"

Related Adjective(s):canonic, sanctioned

3.Definition: of or relating to or required by canon law

Related Adjective(s):canonic

4.Definition: reduced to the simplest and most significant form possible without loss of generality

"A canonical syllable pattern"

Related Adjective(s):basic, canonic