non·stand·ard

[non-stan-derd]
adjective
1.
not standard.
2.
not conforming in pronunciation, grammar, vocabulary, etc., to the usage characteristic of and considered acceptable by most educated native speakers; lacking in social prestige or regionally or socially limited in use: a nonstandard dialect; nonstandard English. Compare standard ( def 27 ).
3.
Mathematics. of or pertaining to a generalized system of numbers that includes the real numbers but also includes infinite and infinitesimal numbers: nonstandard analysis.

Origin:
1920–25; non- + standard

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World English Dictionary
nonstandard (nɒnˈstændəd) [Click for IPA pronunciation guide]
 
adj
1.  denoting or characterized by idiom, vocabulary, etc, that is not regarded as correct and acceptable by educated native speakers of a language; not standard
2.  deviating from a given standard

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Nonstandard is always a great word to know.
So is common divisor. Does it mean:
a system of calculation based on the properties of numbers; the discussion of a problem by algebra consisting of calculus and its higher developments
a number that is a submultiple of all the numbers of a given set
Example sentences
For example, some math questions were nonstandard and required creative thought
  to determine the answer quickly.
Nonstandard models, which are useful in math, demonstrate that various
  conditions can be satisfied in more than one way.
Other nonstandard features include a daily wine social, a free shoe-shine and
  an eco-friendly policy.
There may be many other sentences which mean the consistency under nonstandard
  interpretations.
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