IPA: /dɪˈkæθliːt/
KK: /dɪˈkæθlit/
A person who competes in a decathlon, which is a track and field event consisting of ten different athletic contests.
The decathlete trained hard to improve his performance in all ten events.
Decathlete → It is formed from "deca-" (from Greek "deka", meaning ten) and "athlete" (from Greek "athlētēs", meaning one who competes for a prize). The word "decathlete" refers to an athlete who competes in ten different track and field events.
Think of the prefix 'deca-' meaning ten, and remember that a decathlete is someone who competes in ten events.