[uo adv. "together" (PE17:191)]
Quenya
uo
adverb. together
uo
together
uo
adverb. together
uomë
noun. community
úpa
dumb
úpa adj. "dumb" (i.e. unable to speak) (PE17:126)
o-
prefix. together
A prefix meaning “together” derived from primitive √WO (WJ/367). The modern Quenya form of the prefix is the result of the sound change whereby “unstressed wo was often reduced to o with loss of w” (PE19/106). Note that “when stressed the [primitive] sequence wo was usually changed > wa”, so in theory Quenya might have a variant prefix ✱va- “together” that was the result of an ancient stressed prefix, much like Sindarin go- vs. gwa-. However, there is no sign of such a prefix va- in Quenya. Instead, the short o- became ó- in those rare cases where it was stressed (WJ/367).
In the Quendi and Eldar essay from 1959-60 Tolkien said that o- was “used in words describing the meeting, junction, or union of two things or persons, or of two groups thought of as units”, as opposed to yo- used for three or more things (WJ/361, 367). In examples elsewhere, though, o- “together” seems to have a more general meaning in words like olass(i)ë “foliage, collection of leaves” or ombari “company, dwellers together” (NM/117). I would therefore assume yo- is only used when plurality was emphasized, and o- “together” was the default choice otherwise.
Conceptual Development: The earliest precursor to this suffix appeared in the Gnomish Lexicon of the 1910s as ᴱQ. ma- “together” derived from primitive ᴱ✶ŋu̯a (GL/40). This was part of a paradigm in which G. go- was the result of unstressed ᴱ✶ŋu̯a, and gwa- was the normal phonological result. There was also an apparently related suffix ᴱQ. -ngwe in the Narqelion poem in phrases like ómalingwe lir’ amaldar = “✱(together) with voices singing gently”, which could also be derived from primitive ᴱ✶ŋu̯a. The Early Noldorin Dictionary of the 1920s had ᴱQ. va- as the equivalent of ᴱN. go- “together”, probably reflecting a change to primitive ✱wa- (PE13/162).
The Etymologies of the 1930s had both ᴹQ. ō̆- and N. go- “together” derived from the root ᴹ√WŌ̆ (Ety/WŌ). In this new paradigm, N. gwa- was the result of stressed primitive wó-. In Quenya primitive wō and unstressed wŏ blended to produce o- “together”, which could be either short o or long ó. In the Outline of Phonetic Development (OP1) of the 1940s, Tolkien seems to hint that stressed (g)wo- > wá- in Quenya as well (PE19/53). But as noted above there are no examples of prefixal wa-/va- “together” in actual Quenya words from Tolkien’s later writings.
wa-
prefix. together
ostar
noun. community
The adverb uo “together” appeared as a derivative of ✶ówō in a rejected page of notes on the etymology about the prefix o- of the same meaning, probably from around 1959 (PE17/191).
Neo-Quenya: Though the page is rejected, the etymology of ᴺQ. uo “together” remains plausible, so I would retain this adverb for purposes of Neo-Quenya.