the GNU version of the Collaborative International Dictionary of English
n. The state or quality of being canonical; agreement with the canon.
The Century Dictionary and Cyclopedia
n. The quality of being canonical; canonicalness.
Word Usage
"In his 1932 book Sherlock Holmes: Fact or Fiction , T. S. Blakeney used the term canonicity in reference to the mystery novels and short fiction of Arthur Conan Doyle."