onivet = were (verb "to be"/"to exist" - past tense - they were - 3rd person plural) (some things Google found for "onivet": a rare term; user names; Onivet Medserv SRL of Romania for veterinary services)
Word derivation for "they were" (to exist) :
Basque = ziren, Finnish = olivat
Miresua = onivet
This is a correction. I must have been looking at the wrong Basque verb conjugation earlier. My previous word, onivan, didn't follow my established rules. It used two "N" when there was only one "N" between Basque and Finnish words available. Oops!