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nonstandard
This term carries a neutral to technical tone, though its connotation shifts depending on the field. In technical or industrial contexts, it simply indicates a deviation from a formal specification or a lack of uniformity, often implying a need for custom adaptation or a lack of compatibility.
In linguistics, the term is used descriptively to identify dialects or registers that differ from the prestige variety. It avoids the pejorative weight of words like incorrect or improper, focusing instead on the sociological fact that the speech pattern does not align with the institutionalized norm of a language.
Meanings
Not conforming to the established standard, rule, or conventional norm of a particular field or society.
The company uses a nonstandard measurement system that differs from the metric system.