nonstandard: Meaning and Definition of

non•stand•ard

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:Cf.(def. 27). a nonstandard dialect; nonstandard English.
3. of or pertaining to a generalized system of numbers that includes the real numbers but also includes infinite and infinitesimal numbers: nonstandard analysis.