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Douglas Harper's Etymology Dictionary
essive

1885, from Finnish essiivi, from Latin esse (see essence).

Wiktionary
essive

a. 1 (context grammar English) of, or relating to the grammatical case that in some languages indicates existence in a state or capacity 2 (context rare English) indicating a temporary state of being. n. (context grammar English) the essive case, or a word in that case

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