noun
a person who advocates or adheres to a prescriptive attitude or doctrine, especially in language usage
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The prescriptivist linguist argued that certain grammar rules must be followed at all times.
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My friend is such a prescriptivist when it comes to punctuation in text messages.
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Don't be such a prescriptivist about how I speak, it's annoying.
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The chef was a prescriptivist when it came to following the recipe exactly.