equestriana.[L. equester, from eques horseman, fr. equus horse: cf. F. questre. See Equine.]1. Of or pertaining to horses or horsemen, or to horsemanship; as, equestrian feats, or games.()2. Being or riding on horseback; mounted; as, an equestrian statue.()An equestrian lady appeared upon the plains. (Spectator.)3. Belonging to, or composed of, the ancient Roman equities or knights; as, the equestrian order.(Burke.)n. One who rides on horseback; a horseman; a rider.()