Olympiad
/əʊˈlɪmpɪæd/noun
1- a celebration of the ancient or modern Olympic Games（古代或现代）奥林匹克运动会。
1.1
- a period of four years between Olympic Games, used by the ancient Greeks in dating events（古希腊人用于标注两次奥林匹克运动会之间事件日期的）四年时间。
1.2
- a major national or international contest in some activity, notably chess or bridge（国际象棋或桥牌等的）全国（或国际）大赛。
词源
via French or Latin from Greek Olumpias Olumpiad-, from Olumpios （see also O LYMPIAN and O LYMPIC）.