nonstandard
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(a) not conforming to the language usage of a prestige group within a community
- a nonstandard dialect is one used by uneducated speakers or socially disfavored groups
- "the common core of nonstandard words and phrases in folk speech"- A.R.Dunlap
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(a) varying from or not adhering to a standard
- nonstandard windows
- envelopes of nonstandard sizes
- nonstandard lengths of board
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(a) not standard; not accepted as a model of excellence
- a nonstandard text