Canon: A term referring to the authoritative status of the final formation and collection of the biblical books (the term means “measuring rod, standard”).

The order of these books sometimes differs (see Tanak for the Hebrew order of the canon), and which books comprise the canon may differ (the Catholic canon contains the Apocrypha, which are sometimes referred to as “deuterocanonical”), but the list of books in the canon are sanctioned as the norm from which doctrine and practice are derived.

...Canon thus refers to the books themselves or their authoritative function in the community of believers and testifies to both the adaptability and stability of Scripture.

Patzia & Petrotta, Pocket Dictionary of Biblical Studies (2002), 22.