canonical

Etymology

canon + -ical or canonic + -al.

adj

1. Present in a canon, religious or otherwise.
   The Gospel of Luke is a canonical New Testament book.
   In a word, they were made uſe of by the immediate ſucceſſors of the Apoſtles, and many of them read in the Public Aſſemblies of Chriſtians, as Canonical Scripture, without the leaſt mark of Diſtinction, in point of Autority[…] 1732, George Reynolds, A diſſertation: or, Inquiry Concerning the Canonical Autority of the Goſpel according to Mathew;[…], 2nd edition, page 4
2. According to recognised or orthodox rules.
   The men played golf in the most canonical way, with no local rules.
3. Stated or used in the most basic and straightforwardly applicable manner.
   the reduction of a linear substitution to its canonical form
4. Prototypical.
5. (religion) In conformity with canon law.
6. (music) In the form of a canon.
7. (religion) Of or pertaining to an ecclesiastical chapter
8. (mathematics, computing) In canonical form.
9. (mathematics) Distinguished among entities of its kind, so that it can be picked out in a way that does not depend on any arbitrary choices.
   {{quote-web|en|date=7-2-2011|author=Samson Abramsky|title=Introduction to Categories and Categorical Logic|url=http://arxiv.org/abs/1102.1313|text=It turns out that ordered pairs can be defined in set theory, e.g. as (x,y):=x,y,y. Note that in no sense is such a definition canonical.|coauthors=Nikos Tzevelekos|page=19}}
10. (fandom slang) Part of canon (“the main continuity of a fictional universe”).

noun

1. (plural only) The formal robes of a priest.
   He, good man, could make but little of his solitary friend, and must many a time have been startled out of his canonicals by the strange, alien speeches which he heard. 1857, Various, The Atlantic Monthly, Volume 1, Issue 2, December, 1857
   Mr Altham rose, as in duty bound, in honour to a priest, and a priest who, as he dimly discerned by his canonicals, was not altogether a common one. 1891, Emily Sarah Holt, The White Lady of Hazelwood
   When I was a boy I was a passionate atheist, I defied God, and so far as God is the mere sanction of social traditions and pressures, a mere dressing up of the crowd's will in canonicals, I do still deny him and repudiate him. 1915, H. G. Wells, The Research Magnificent
2. (Internet) A URL presented in canonical form.
   Google advises canonicals as one of the preferred methods of treating duplicate content in your CMS. 2015, Simon Kloostra, Joomla! 3 SEO and Performance, page 63