each of two, either, each singly , (Herdotus Historicus), etc.:—;in singular, with a plural noun, like Lat. uterque, ταῦτα εἰπόντες ἀπῆλθον ἑκάτερος (Xenophon Historicus); except when each party is a plural, (Plato Philosophus)

(ML)