a man skilled in equitation
"The equestrian gracefully executed a series of complex jumps on his horse."
One who rides a horse.
"The equestrian gracefully balanced on the saddle as she led her mount through the field."
of or relating to or composed of knights
"The medieval tournament featured an equestrian display where knights competed in jousting on horseback."
of or relating to or featuring horseback riding
"The equestrian statue in the town square depicts a rider on horseback."
Of horseback riding or horseback riders.
"The equestrian event showcased skills in jumping and dressage performed by expert horseback riders."
In plain English: Equestrian means something related to riding horses.
"The equestrian statue in the town square was polished every morning by the city workers."
Usage: Use this adjective to describe anything related to the sport of horseback riding, such as equestrian events or gear. It specifically refers to activities involving horses rather than general animal training.
The word comes from the Latin equestrian, which originally meant "pertaining to cavalry." It entered English through this same root, derived ultimately from the Latin word for horse.