I. i-ˈkwes-trē-ən adjective
Etymology: Latin equestr-, equester of a horseman, from eques horseman, from equus horse — more at equine
Date: circa 1681
1.
a. : of, relating to, or featuring horseback riding
equestrian Olympic events
b. archaic : riding on horseback : mounted
c. : representing a person on horseback
an equestrian statue
2. : of, relating to, or composed of knights
II. noun
Date: 1774
: one who rides on horseback