The Greek adjective/noun hēmisu (ἥμισυ) means half, a half, one-half. It appears five times in the NT (Mark 6:23; Luke 19:8; Rev 11:9, 11; 12:14). The English prefix 'hemi-' (as in hemisphere) derives from this root.
Herod's extravagant promise — 'Ask me for whatever you wish, and I will give it to you... up to hēmisu of my kingdom' (Mark 6:23) — echoes the Persian king's offer to Esther (Esth 5:3) and represents the reckless generosity of a ruler intoxicated by spectacle. In stark contrast, Zacchaeus' declaration — 'Behold, Lord, the hēmisu of my goods I give to the poor' (Luke 19:8) — represents genuine, sober generosity born of repentance. In Revelation, the 'three and a hēmisu days' (Rev 11:9, 11) that the two witnesses lie dead in the street echo Daniel's 'time, times, and half a time' (Dan 7:25; 12:7), representing a period of tribulation that God sovereignly limits.