ἥμισυ

ἀνάγκᾳ δ' οὐδὲ θεοὶ μάχονται → but not even gods fight necessity (Simonides, fr. 37.1.29)

English (Strong)

neuter of a derivative from an inseparable prefix akin to ἅμα (through the idea of partition involved in connection) and meaning semi-; (as noun) half: half.

ἥμῐσυ: I τό (sc. μέρος) половина (τοῦ στρατοῦ Thuc.): ἥ. οὗ δεῖ Plat. половина того, что нужно.
II adv. пополам Hes., Pind.