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!

Qenya 

onar(yas)

adverb. on one and the same day

The correlatives ᴹQ. onar or onaryas appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/100, 109), a combination of ᴹQ. on- “same” and ᴹQ. -ar(yas) “days”.

Neo-Quenya: For purposes of Neo-Quenya I would update this to ᴺQ. imaurë “on the same day” using im- “same” and aurë “day”.

Qenya [PE23/100; PE23/109; PE23/110] Group: Eldamo. Published by