Definition of pentathlons:
(n) :
An ancient athletics discipline, featuring five events: stadion, wrestling, long jump, javelin and discus
(n) :
(athletics) Ellipsis of modern pentathlon, a discipline with five events based on late-19th century basic military skills. [An athletics event where athletes compete in épée fencing, shooting, freestyle swimming, show jumping and cross country.]
(n) :
(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”).