Proto-IE: *ē
Meaning: part.
Old Indian: ā́ `emphatic particle after adverbs and nouns'
Old Greek: ē̂ hervorgebend und fragend 'wirklich', ḗtoi̯, epei̯ḗ, ḕ, hom. ēè < *ēwé, ē-mén--ē-dé, ḗ-dē
Germanic: OHG ihh-ā 'ich (gerade)', nein-ā 'nein' usw.