An adjective meaning “(con)similar, alike” in notes from around 1957 based on vëa “seeming, apparent”, with variant forms vávea and ovéa (PE17/189). I think it likely that the accents here mark stress rather than length, and ovea has an abnormal stress pattern with the stress on the 2nd syllable despite being short. The variant forms of the prefix o- “together” would be the result of the varying stress.

Conceptual Development: The Qenya Lexicon of the 1910s had a similar word ᴱQ. sovea “alike” using the earlier prefix ᴱQ. so- “together” (QL/85). In this period ᴱQ. vea meant “similar, like” (QL/101).

Neo-Quenya: Boris Shapiro proposed óvea “alike” as neologism in Parma Penyanë Quettaron (PPQ) from the early 2000s, several years before the publication of Tolkien’s use of the word.