adj. 1.  Of or relating to horseback riding or horseback riders. 2.  Depicted or represented on horseback: an equestrian statue of a famous monarch. n.  One who rides a horse or performs on horseback. [From Latin equester, equestr-, from eques, horseman, from equus, horse; see  ekwo- in the Appendix of Indo-European roots.] e·questri·an·ism,  e·questri·an·ship n.  | 
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