Enter a clue or pattern or both:
The Clue
Quadrennial events (9 letter answer)
The Answer
OLYMPIADS
Tags
Notes
The answer OLYMPIADS is so rare that it appears less than once every 2500 puzzles.
Definition
OLYMPIAD as a noun:
1. one of the four-year intervals between Olympic Games; used to reckon time in ancient Greece for twelve centuries beginning in 776 BC
2. (Olympic Games, Olympics, Olympiad) = the modern revival of the ancient games held once every 4 years in a selected country