Longman Dictionary of Contemporary English
The Collaborative International Dictionary
nonstandard \nonstandard\, non-standard \non-standard\adj.
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varying from or not adhering to a standard; as, nonstandard windows; envelopes of nonstandard sizes; non-standard lengths of board cost more per foot. Opposite of standard. [Narrower terms: deficient, inferior, substandard]
Syn: nonstandard.
(Linguistics) Not conforming to the language usage of a prestige group within a community; as, a nonstandard dialect is one used by uneducated speakers or socially disfavored groups. Opposite of standard.
Douglas Harper's Etymology Dictionary
Wiktionary
a. (alternative spelling of nonstandard English)
Usage examples of "non-standard".
Omega-inconsistent number theories were non-standard versions of arithmetic, based on axioms that "almost" contradicted each othertheir saving grace being that the contradictions could only show up in "infinitely long proofs" (which were formally disallowed, quite apart from being physically impossible).
The machine was eventually able to translate Azerbaijani-language newspapers printed in a non-standard version of the Cyrillic alphabet.
Not everyone can handle being imprinted into a non-standard human shape, but I hear it's a growing fashion among trendsetters.
And most of these sons of bitches used non-standard abbreviations like mad.