the prefix "dec" means ten, so i would say that an athlete participates in ten different events.
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There are ten events in an Olympic Decathlon. Some of the events include running, shooting a rifle, bicycling, and swimming. The decathlon takes two days for all of the events to be finished.
A decathlete takes part, or competes, in ten events. These events are as a whole refer to as a decathlon.
There are ten events in a decathlon. Because deca means ten so it's ten events. That's the root word for decathlon.