means A return to one's home or origin, especially the annual celebration when former students, athletes, and alumni come back to their old school for festivities, a game, and a dance.

from A plain English compound, joining 'home' (Old English 'hām,' the dwelling place, related to German 'Heim') with 'coming,' the act of arriving. The word for the literal act of returning home is centuries old, but the American school tradition — alumni streaming back to a campus for a football game and reunion — took the name in the early 20th century, and the high-school dance later borrowed it from there.