Qenya
umanar(yas)
adverb. someday; in a certain day
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
umanar(yas)
adverb. someday; in a certain day
The correlatives ᴹQ. umanar “someday” and um(an)aryas “in a certain day” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/109), a combination of ᴹQ. uma- “some” and ᴹQ. -ar(yas) “day”.
Neo-Quenya: For purposes of Neo-Quenya I would update this to ᴺQ. umaurë “someday” using Q. aurë “day”.