1. not included in or conforming to an official or standard list, collection, or set of rules
Usage: commonly used in religious, literary, and scientific contexts
2. not recognized as authentic or authoritative by established tradition or authority
Usage: often used in biblical and religious scholarship

Examples

• The noncanonical gospels were excluded from the official Bible.
• Some scholars argue that certain noncanonical texts provide valuable historical insights.
• The software uses a noncanonical approach to data processing that differs from industry standards.
• Noncanonical interpretations of the classic novel have sparked academic debate.
• The band's noncanonical remix was not included on the official album.
• In mathematics, noncanonical forms can still be mathematically valid.
• The museum displayed both canonical and noncanonical works by the artist.