Etymology

T- from plural (from ligature particle të) + archaic singular jetër, from Proto-Albanian sg. *étera, pl. *etérai, from Proto-Indo-European *h₁e-tero- (compare Latin cēterus ‘the other one’, Umbrian etro- ‎(“another”), Ancient Greek ἕτερος ‎(héteros, “other, another ; different”), Old Church Slavonic eterŭ ‘someone’, Avestan atāra ‘this one of the two’).