Equestrian

a. [Lat. equestris, equester, from eques, horseman, from equus, horse; Fr. équestre, It. equestre.]

1. Pertaining to horses or their management, and the art of riding; as, equestrian matters.
2. Riding on horseback habitually. “A certain equestrian order of ladies.” Steele.
3. Representing a person on horseback; as, an equestrian statue.
4. Performed by one who is riding on horseback; as, equestrian feats, or games.
5. Belonging to Roman equites or knights, or to their order. Kennet.