entya, enetya adj. "central, middle" (VT41:16; these forms, as well as the noun entë "centre", come from a late, somewhat confused source; the adjective #endëa and the noun endë from earlier material may fit the general system better, and #endëa is even found in the LotR itself as part of the word atendëa, q.v.)
Quenya
entya
adjective. central, middle
entya
central, middle
enetya
enetya
enetya, see entya
entë
center
entë (2) noun "center" (VT41:16; endë is perhaps to be preferred, see entya)
An adjective appearing as {ened >>} entya “central, middle” in notes from the late 1960s, derived from primitive ✶enetya since in this note Tolkien was considered revising its root to √HENET (VT41/16).
Neo-Quenya: Since the root for “middle” was usually √ENED, I’d ignore this late revision and stick with ᴹQ. enya < ✶en[e]dya from The Etymologies (Ety/ÉNED).