Definition of equestrian adjective from the Oxford Advanced Learner's Dictionary

 

equestrian

 adjective
adjective
BrE BrE//ɪˈkwestriən//
 
; NAmE NAmE//ɪˈkwestriən//
 
[usually before noun]
 
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connected with riding horses, especially as a sport equestrian events at the Olympic Games an equestrian statue/portrait (= one of a person on a horse) Word Origin mid 17th cent. (as an adjective): from Latin equester ‘belonging to a horseman’ (from eques ‘horseman, knight’, from equus ‘horse’) + -ian.
See the Oxford Advanced American Dictionary entry: equestrian