Pronunciation: (non'stan'durd), [key]
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. Cf. standard (def. 27).
3. Math.of or pertaining to a generalized system of numbers that includes the real numbers but also includes infinite and infinitesimal numbers: nonstandard analysis.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.