nonstandard d=2

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Also see: d=2

non•stand•ard adj.

not standard.
Linguisticsnot agreeing with the pronunciation, grammar, vocabulary, etc., that is felt to be the usage considered acceptable by most educated native speakers:nonstandard English.Compare standard (def. 11).

non•stand•ard adj.

not standard.
Linguisticsnot 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.Cf. standard (def. 27).
Mathematicsof or pertaining to a generalized system of numbers that includes the real numbers but also includes infinite and infinitesimal numbers:nonstandard analysis.

Collins Concise English Dictionary © HarperCollins Publishers::

nonstandard /ˌnɒnˈstændəd/ adj

denoting language characterized by idiom, vocabulary, etc, that is not regarded as correct and acceptable; not standard
deviating from a given standard

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