Definition of "pentathlon"

An ancient athletics discipline, featuring five events: stadion, wrestling, long jump, javelin and discus  examples

(athletics) Ellipsis of women's pentathlon.; A 20th-century athletics discipline for women, the women's counterpart of the men's decathlon, the predecessor to the women's heptathlon, featuring five events: hurdles, shot put, high jump, long jump, and a run  examples

(athletics) Ellipsis of modern pentathlon.; a discipline with five events based on late-19th century basic military skills  examples