Qenya
sainen
adverb. *by that means (mentioned)
sa
that [anaphoric]
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!
The correlative ᴹQ. sainen appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111), a combination of ᴹQ. sa “that [anaphoric]” and the instrumental suffix ᴹQ. -nen.
Neo-Quenya: For purposes of Neo-Quenya I would update this to ᴺQ. sanen “by that means (mentioned)” to be more consistent with the later use of singular instrumentals in correlatives: Q. sinen “by this means”.