What year was the term that refers to the four-year period between olympic games first used?

In the summer of 776 BC.

In the summer of 776 BC was when the first Olympiad began. An Olympiad is an official four-year period associated with the Olympic Games. The ancient Greeks founded the original Olympic Games. The ancient Greeks used Olympiads to keep track of time and later switched their time reckoning by numbering the year within an Olympiad from 1 to 4

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