Definition of decathlon
: a 10-event athletic contest
specifically
: a composite contest that consists of the 100-meter, 400-meter, and 1500-meter runs, the 110-meter high hurdles, the javelin and discus throws, shot put, pole vault, high jump, and long jump
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Merriam-Webster unabridged
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The first known use of decathlon was in 1910
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