prescriptivismnoun [ U ]
/prɪˈskrɪp.tɪ.vɪ.zəm/specialized language the belief that there are correct and wrong ways to use language and that books about language should give rules to follow, rather than describing how language is really used:
There has been a blurring of the sharp distinction between descriptivism and prescriptivism in the writings of grammarians and lexicographers.
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descriptivism