Thread:User talk:CodeCat/cum Latin

I don't have any good books on Old Latin, so I can't be sure, but this etymology looks wrong to me. For one, it's linked to a PIE form that we haven't added, which makes me a little suspicious. Mostly, though, I don't like that there's one etymology for two distinct parts of speech. The conjunction governs the subjunctive mood; before Augustus, it was usually spelled or. The preposition governs a case, instead (the ablative) and a brief check doesn't reveal any other spellings. I could be wrong, but I see two distinct terms that merged into a single standardised spelling, and that would mean two etymologies. Can you shed some light on this?