How to say "holiday, festival" in Arabic

ʿĪd comes from ʿ-w-d, 'to return, recur' — the same root, letter for letter, as Hebrew עוד ('again, still') and עדות ('testimony', an account repeated). The word learners reach for instinctively, מועד ('appointed festival time'), sounds like a cousin but is actually built on a different root, י-ע-ד ('to appoint') — two separate roots converging on the same idea of a recurring sacred time.