Meaning : Not conforming to the language usage of a prestige group within a community.
Example :
A nonstandard dialect is one used by uneducated speakers or socially disfavored groups.
The common core of nonstandard words and phrases in folk speech.
Meaning : Varying from or not adhering to a standard.
Example :
Nonstandard windows.
Envelopes of nonstandard sizes.
Nonstandard lengths of board.
Conforming to or constituting a standard of measurement or value. Or of the usual or regularized or accepted kind.
Windows of standard width.Meaning : Not standard. Not accepted as a model of excellence.
Example :
A nonstandard text.
Established or well-known or widely recognized as a model of authority or excellence.
A standard reference work.