es·sive 
(ĕsĭv)
(ĕsĭv)adj.
Of, relating to, or being the grammatical case indicating a state of being or an existence in a particular capacity or state in some languages, as in Finnish professorina, "as a professor."
n.
1. The essive case.
2. A word or form in the essive case.
[Finnish essiivi, from New Latin essīvus : Latin esse, to be; see es- in the Appendix of Indo-European roots + Latin -īvus, -ive.]