1)a: of, relating to, or featuring horseback riding
b: riding on horseback: mounted
c: representing a person on horseback
2) : of, relating to, or composed of knights
: one who rides on horseback
Origins of Equestrian
Latin equestr-, equester of a horseman, from eques horseman, from equus horse
Equestrian Riding, Equestrianism, are all names for the same thing, riding a horse. Equestrian riding, is a broad term for the act of working with or using a horse for work, transportation, recreational activities, artistic or cultural and competitive exercises. Horse and humans have evolved together. From humble beginnings, used for transportation, food, and herding, the horse has evolved to be an almost equal partner in the equestrian team. In modern times horses are still used for ranch work and transportation, however their job now can include police work and competitive events. Horses are even used for therapeutic benefits.
However equestrian riding really does encompass every aspect of horse work. From English riding and all of the variations of, hunt seat/hunter jumper, eventing, show jumping, dressage, and saddle seat.