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nonstandard

[non-stan-derd]
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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 relating to a generalized system of numbers that includes the real numbers but also includes infinite and infinitesimal numbers: nonstandard analysis.
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Origin of nonstandard

First recorded in 1920–25; non- + standard

Usage note

A term labeled Nonstandard in this dictionary is one that is thought to be characteristic of the speech of persons with little education—a term that is often regarded as a marker of low social status.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for non-standard

nonstandard

adjective
  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
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for non-standard

adj.

also nonstandard, 1926, from non- + standard. A linguist's value-neutral term for language formerly stigmatized as "bad" or "vulgar."

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Online Etymology Dictionary, © 2010 Douglas Harper