ᴹQ. aia- pref. “other, different (of larger numbers)” (Category: Different, Other)
A prefix for “other, different” appearing Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/99). Tolkien considered several prior forms on the page where it appeared: {asta} >> {aia < asya} >> aia < ᴹ√AYA (PE23/99 note #27). Earlier drafts had {ar} (PE23/101 note #36) >> {ap-, apana-} >> {war- < gwar-} (PE23/102 note #36). Forms appearing in the rest of the document mostly showed {war(a)-} >> ai(a)-.
Neo-Quenya: For purposes of Neo-Quenya, I would use later hya- as the basis for “other” words, as with (pron.) hya “other thing” and (adj.) hyana “other” (VT49/14).
References ✧ PE23/99, 101-102
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