-ment
-ment suffix forming nouns, originally from French and representing L. -mentum, which was added to verb stems sometimes to represent the result or product of the action. French inserts an -e- between the verbal root and the suffix (e.g. commenc-e-ment from commenc-er; with verbs in ir, -i- is inserted instead (e.g. sent-i-ment from sentir). Used with English verb stems from 16c. (e.g. merriment, which also illustrates the habit of turning -y to -i- before this suffix).

Etymology dictionary. 2014.

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