WordWeb Online

1. Reduced to the simplest and most significant form possible without loss of generality
   "a canonical syllable pattern";
   - basic, canonic
    
2. Conforming to orthodox or recognized rules
   "the drinking of cocktails was as canonical a rite as the mixing";
   - canonic, sanctioned
    
3. Appearing in a biblical canon
   "a canonical book of the Christian New Testament";
   - canonic
    
4. Of or relating to or required by canon law
   - canonic

See also: orthodox, standard

Encyclopedia: Canonical