The suffix -ment forms nouns from verbs, e.g. entertainentertainment.

A similar suffix exists in French (and -mente in other Romance languages) that forms adverbs from adjectives, e.g. sûrsûrement, which comes from Latin mentus.

Is the English noun suffix related to (cognate with) French adverb suffix? If so, then how did it became v. → n. from adj. → adv.? If not, where does it come from?

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    When asking questions about etymology, you should always look up the word you’re asking about on Etymonline and include in the question what that tells you. If that sufficiently answers the question, you can delete it; if it doesn’t, add in what remains unclear so we have a ‘sharper’ question to answer. (In this case, note the difference between -ment added to verbs, as in English, and -ment(e) added to adjectives, as in Romance languages.) – Janus Bahs Jacquet Jan 26 at 13:08
  • @JanusBahsJacquet Thanks! Didn't know that site before. – iBug Jan 26 at 13:19
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    This is an interesting question. Please don’t delete it. If you find the answer yourself, consider posting it as an answer. In case you’re wondering, answering your own questions is not only permitted; Stack Exchange explicitly encourages it. – Lawrence Jan 26 at 14:28
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    French uses -ment both to turn verbs into nouns and adjectives into adverbs. See Wiktionary. – Peter Shor Jan 26 at 18:27
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    French has nouns établissement and divertissement. So a better question might be why English doesn't use -ment to create adverbs, but instead uses -ly. – Barmar Jan 28 at 19:43

From https://www.etymonline.com/word/-ment?ref=etymonline_crossreference:


common suffix of Latin origin forming nouns, originally from French and representing Latin -mentum, which was added to verb stems to make nouns indicating the result or product of the action of the verb or the means or instrument of the action. In Vulgar Latin and Old French it came to be used as a formative in nouns of action.

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