Definitions for "decathlon"
In the modern Olympic Games, a composite contest consisting of a 100-meter run, a broad jump, putting the shot, a running high-jump, a 400-meter run, throwing the discus, a 100-meter hurdle race, pole vaulting, throwing the javelin, and a 1500-meter run.
an athletic contest consisting of ten different events
an athletic contest that is a combination of ten track and field events