(1)a traveler who actively rides an animal (as a horse or camel)
(2)積極的に(馬やラクダのような)動物に乗る旅行者
(3)someone employed to ride horses in horse races
(4)競馬で馬に乗るために雇われる人
(5)a man skilled in equitation
(6)馬術に熟練した男性