The modern German noun for intense aversion, rejection, or hostility toward a person, group, or institution. Duden traces Middle and Old High German haʒ to suffering, sorrow, and resentment and records the 1996 spelling change from Haß to Hass. DWDS/Pfeifer reports the Old High German noun from the eighth century and places it in the Germanic family of Old Saxon heti, Old English hete, Old Norse hatr, Gothic hatis, and related forms. Grimm’s DWB preserves a more complicated semantic record: hostile pursuit or action, anger expressed in deeds, ordinary hostile disposition, and even measured rivalry during friendly competition. The reviewed route reuses *hatiz- and the qualified *ḱh₂d-es- / *ḱeh₂d- comparison, then stops.