noun
heptathlon
A track and field combined event consisting of seven disciplines. In Japanese, it typically refers to the women's heptathlon; the men's equivalent is the decathlon (十種競技).
彼女は七種競技で金メダルを獲得した。
She won the gold medal in the heptathlon.
Decathlon, a men's combined event with ten disciplines, as opposed to the seven in the heptathlon.
Compound of 七種 (seven kinds) and 競技 (competition), directly corresponding to the English 'heptathlon'.