from
The Collaborative International Dictionary of English v.0.48
Olympiad \O*lym"pi*ad\ ([-o]*l[i^]m"p[i^]*[a^]d), n. [L.
olympias, -adis, Gr. 'olympia`s, 'olympia`dos, fr. 'O`lympos
Olympus, a mountain in Macedonia: cf. F. olympiade.]
1. (Greek Antiq.) 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[oe]bus in the foot race, which
took place in the year 776 b. c.; as, the era of the
olympiads.
[1913 Webster]
2. The quadrennial celebration of the modern Olympic games;
as, the first Olympiad (1906). See {Olympics}.
Syn: Olympic games, Olympics.
[Webster 1913 Suppl.] Olympian