canonical

[kuh-non-i-kuhl]
adjective Also, canonic.
1.
pertaining to, established by, or conforming to a canon or canons.
2.
included in the canon of the Bible.
3.
authorized; recognized; accepted: canonical works.
4.
Mathematics. (of an equation, coordinate, etc.) in simplest or standard form.
5.
following the pattern of a musical canon.
6.
Linguistics. (of a form or pattern) characteristic, general or basic: the canonical form of the past tense; a canonical syllable pattern.
noun
7.
canonicals, garments prescribed by canon law for clergy when officiating.

Origin:
1150–1200; Middle English (< Anglo-French) < Medieval Latin canōnicālis, equivalent to canōnic(us) (see canon2) + -ālis -al1

canonically, adverb
supercanonical, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
canonical or canonic (kəˈnɒnɪkəl)
 
adj
1.  belonging to or included in a canon of sacred or other officially recognized writings
2.  belonging to or in conformity with canon law
3.  according to recognized law; accepted
4.  music in the form of a canon
5.  of or relating to a cathedral chapter
6.  of or relating to a canon (clergyman)
 
canonic or canonic
 
adj
 
ca'nonically or canonic
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

canonical
early 15c., from M.L. canonicalis, from canonicus, from Gk. kanonikos (see canon). Earlier was canonial (early 13c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

canonical

adj. [very common; historically, `according to religious law'] The usual or standard state or manner of something. This word has a somewhat more technical meaning in mathematics. Two formulas such as 9 + x and x + 9 are said to be equivalent because they mean the same thing, but the second one is in `canonical form' because it is written in the usual way, with the highest power of x first. Usually there are fixed rules you can use to decide whether something is in canonical form. The jargon meaning, a relaxation of the technical meaning, acquired its present loading in computer-science culture largely through its prominence in Alonzo Church's work in computation theory and mathematical logic (see Knights of the Lambda Calculus). Compare vanilla.

Non-technical academics do not use the adjective `canonical' in any of the senses defined above with any regularity; they do however use the nouns `canon' and `canonicity' (not **canonicalness or **canonicality). The `canon' of a given author is the complete body of authentic works by that author (this usage is familiar to Sherlock Holmes fans as well as to literary scholars). `_The_ canon' is the body of works in a given field (e.g., works of literature, or of art, or of music) deemed worthwhile for students to study and for scholars to investigate.

The word `canon' has an interesting history. It derives ultimately from the Greek `kanon' (akin to the English `cane') referring to a reed. Reeds were used for measurement, and in Latin and later Greek the word `canon' meant a rule or a standard. The establishment of a canon of scriptures within Christianity was meant to define a standard or a rule for the religion. The above non-techspeak academic usages stem from this instance of a defined and accepted body of work. Alongside this usage was the promulgation of `canons' (`rules') for the government of the Catholic Church. The techspeak usages ("according to religious law") derive from this use of the Latin `canon'.

Hackers invest this term with a playfulness that makes an ironic contrast with its historical meaning. A true story: One Bob Sjoberg, new at the MIT AI Lab, expressed some annoyance at the incessant use of jargon. Over his loud objections, GLS and RMS made a point of using as much of it as possible in his presence, and eventually it began to sink in. Finally, in one conversation, he used the word `canonical' in jargon-like fashion without thinking. Steele: "Aha! We've finally got you talking jargon too!" Stallman: "What did he say?" Steele: "Bob just used `canonical' in the canonical way."

Of course, canonicality depends on context, but it is implicitly defined as the way _hackers_ normally expect things to be. Thus, a hacker may claim with a straight face that `according to religious law' is _not_ the canonical meaning of `canonical'.
FOLDOC
Computing Dictionary

canonical definition


(Historically, "according to religious law")
1. A standard way of writing a formula. Two formulas such as 9 + x and x + 9 are said to be equivalent because they mean the same thing, but the second one is in "canonical form" because it is written in the usual way, with the highest power of x first. Usually there are fixed rules you can use to decide whether something is in canonical form. Things in canonical form are easier to compare.
2. The usual or standard state or manner of something. The term acquired this meaning in computer-science culture largely through its prominence in Alonzo Church's work in computation theory and mathematical logic (see Knights of the Lambda-Calculus).
Compare vanilla.
This word has an interesting history. Non-technical academics do not use the adjective "canonical" in any of the senses defined above with any regularity; they do however use the nouns "canon" and "canonicity" (not "canonicalness"* or "canonicality"*). The "canon" of a given author is the complete body of authentic works by that author (this usage is familiar to Sherlock Holmes fans as well as to literary scholars). "The canon" is the body of works in a given field (e.g. works of literature, or of art, or of music) deemed worthwhile for students to study and for scholars to investigate.
The word "canon" derives ultimately from the Greek "kanon" (akin to the English "cane") referring to a reed. Reeds were used for measurement, and in Latin and later Greek the word "canon" meant a rule or a standard. The establishment of a canon of scriptures within Christianity was meant to define a standard or a rule for the religion. The above non-technical academic usages stem from this instance of a defined and accepted body of work. Alongside this usage was the promulgation of "canons" ("rules") for the government of the Catholic Church. The usages relating to religious law derive from this use of the Latin "canon". It may also be related to arabic "qanun" (law).
Hackers invest this term with a playfulness that makes an ironic contrast with its historical meaning. A true story: One Bob Sjoberg, new at the MIT AI Lab, expressed some annoyance at the incessant use of jargon. Over his loud objections, GLS and RMS made a point of using as much of it as possible in his presence, and eventually it began to sink in. Finally, in one conversation, he used the word "canonical" in jargon-like fashion without thinking. Steele: "Aha! We've finally got you talking jargon too!" Stallman: "What did he say?" Steele: "Bob just used "canonical" in the canonical way."
Of course, canonicality depends on context, but it is implicitly defined as the way *hackers* normally expect things to be. Thus, a hacker may claim with a straight face that "according to religious law" is *not* the canonical meaning of "canonical".
(2002-02-06)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
His selections include the canonical and the overlooked.
Copying guaranteed that each generation transmitted canonical texts to the next.
The canonical winter icons, stellar snow crystals are thin plates of ice with
  six main arms, or branches.
The canonical viewing position-horizontal-requires balancing a laptop on your
  belly.
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