An adverb glossed “moreover, further(more), what is more” with an adjectival variant Q. enta “another, one more”, both derived from √ENET which is an extension of √EN “once more, again” (VT47/15). Of the adjective Tolkien said that it was “not except by implication ‘another different one’ (VT47/40)”, for which I would instead use hyana; see that entry for discussion.
Conceptual Development: The Arctic Sentence from 1929 had a similar word ᴱQ. ento “next”, a possible precursor.
Neo-Quenya: For purposes of Neo-Quenya, I assume enta only means “another, one more” when used as an adjective. As a pronoun or adverb, I assume [ᴹQ.] enta means “that yonder”, especially when further inflected: á mene entanna “go to that/there yonder” vs. á anta nin enta yulma “give me another [similar] drink” vs. á anta nin hyana yulma “give me another [different] drink”. See the entry on correlatives for further discussion of the “that yonder” use of enta.
entë (2) noun "center" (VT41:16; endë is perhaps to be preferred, see entya)