From Longman Dictionary of Contemporary Englishnon-standardˌnon-ˈstandard adjective 1 SLnon-standard ways of speaking are not usually considered to be correct by educated speakers of a language Non-standard dialects of English are regional dialects.2 DTnot the usual size or type a non-standard disk size
Examples from the Corpus
non-standard• Results show that non-standard entrants achieved more good degrees than other students.• Apart from the non-standard flight instruments the Apache has a convenient office and one rapidly feels at home.• M., the staff will schedule interviews during non-standard hours as necessary.• This, and other similar non-standard methods make d'Compress harder to use than it need be.• It is housed in vertical files which are of non-standard size, and which are no longer manufactured.• The early machines, the 1512 and the 1640, used plastic cases and a non-standard size.• For it is the non-elite institutions that are in the vanguard of recruiting non-standard students.• Example 91 uses non-standard units to avoid a relationship between different measures being known or guessed.From Longman Business Dictionarynon-standardˌnon-ˈstandard adjective not the usual size or typeThe company is to introduce a non-standard week, which would make Saturday and Sunday regular work days. 