Central Semitic, to fix a time; noun *ʿid(at)-, fixed time, appointment, meeting (*-at-, feminine suffix). 'Id al-Fitr, from Arabicʿīd al-fiṭr, feast of breaking the fast, from ʿīd, feast of, from Aramaic ʿed, day of assembly, feast-day, from ʿad, to fix a time.
