Where does “festival” come from?
festival (Norwegian Nynorsk) comes from English festival, from Old French festival, from Latin fēstīvālis, from Latin fēstīvus, from Latin -īvus, from Proto-Indo-European -iHwós, from Proto-Indo-European -wós — Creates adjectives from verb stems.
festival (Norwegian Nynorsk): a festival
Ancestry of “festival”, step by step