Freestyle is used to describe sports competitions, especially in swimming, wrestling, and skiing, in which competitors can use any style or method that they like when they take part.
...the 100m freestyle swimming event.
...the reigning European Freestyle Champion.
...freestyle skiing.
Freestyle is also a noun.
She won the 800 metres freestyle.
freestyle in British English
(ˈfriːˌstaɪl)
noun
1.
a competition or race, as in swimming, in which each participant may use a style of his or her choice instead of a specified style
2.
a.
an amateur style of wrestling with an agreed set of rules
b. Also called: all-in wrestling
a style of professional wrestling with no internationally agreed set of rules
3.
a series of acrobatics performed in skiing, etc
4.
(as modifier)
a freestyle event
freestyle in American English
(ˈfriˌstaɪl)
adjective
1. Sport
not limited to a specified style, pattern of movement, etc.
noun
2.
a.
a freestyle competition
b. Swimming
a race in which contestants may use any stroke but most use the crawl
3.
a style of wrestling in which any hold or throw is allowed