adjective 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.