the modern revival of the ancient games held once every 4 years in a selected country
"Athletes from around the world gather to compete at the Olympics, celebrating the modern revival of the ancient games that are held once every four years."
The Olympic Games.
"Athletes from all over the world gathered in Paris to compete in the Olympics."
The word comes from the Greek name of a place called Olympia and was added to English with an 's' suffix to denote the plural events held there. It traveled into modern usage to refer specifically to the international athletic competitions staged at that ancient site.