Language reform is a kind of language planning by widespread change to a language. The typical methods of language reform are simplification and linguistic purism. Simplification regularizes vocabulary, grammar, or spelling. Purism aligns the language with a form which is deemed 'purer'.

Language reforms are intentional changes to language; this article does not cover natural language change, such as the Great Vowel Shift.

Linguistic purism or linguistic protectionism is the prescriptive practice of recognizing one form of a language as purer or of intrinsically higher quality than others. The perceived or actual decline may take the form of change of vocabulary, syncretism of grammatical elements, or loanwords, and in this case, the form of a language reform.


Examples of language reforms are: