combined competitions; multi-event competition
Refers to athletic events where athletes compete in multiple disciplines and scores are combined, such as the decathlon or heptathlon.
Combined competitions include the decathlon and heptathlon.
十種競技 is specifically the decathlon, a type of 混成競技.
七種競技 is specifically the heptathlon, a type of 混成競技.
Compound of 混成 (mixed, combined) and 競技 (competition, event).