·add. ·noun The quadrennial celebration of the modern Olympic games; as, the first Olympiad (1906).
II. Olympiad ·noun A period of four years, by which the ancient Greeks reckoned time, being the interval from one celebration of the Olympic games to another, beginning with the victory of Cor/bus in the foot race, which took place in the year 776 ·b.c.; as, the era of the olympiads.