1.  horseback riding(n = noun.act) equitation, riding - the sport of siting on the back of a horse while controlling its movements;
is a kind of athletics, sport
has particulars: equestrian sport, pony-trekking
Derived form verb ride horseback₁

2.  horseback riding(n = noun.act) riding - travel by being carried on horseback;
is a kind of travel, traveling, travelling
has particulars: bronco busting, endurance riding, pack riding, trail riding
Derived form verb ride horseback₁

cross-country riding, endurance riding, horseback, horseback rider, little red riding hood, pack riding, ride horseback, riding, riding bitt, riding boot, riding breeches, riding crop, riding habit, riding horse, riding lamp, riding light, riding master, riding mower, riding school, trail riding