The sport, art, or practice of horseback riding, including training and competition.
From 'equestrian' plus '-ism,' a suffix meaning a practice, activity, or set of principles. This nominalization emerged in English in the 19th century as organized equestrian sports developed.
Equestrianism is one of the few sports with roots in actual warfare—dressage movements come from how cavalry horses were trained to respond in battle. Today's fancy prancing horses are basically practicing 500-year-old combat maneuvers!
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