pony (Noun) — Any of various breeds of small gentle horses usually less than five feet high at the shoulder.
pony (Noun) — A range horse of the western United States.
pony (Noun) — An informal term for a racehorse. ex. "he liked to bet on the ponies"
pony (Noun) — A literal translation used in studying a foreign language (often used illicitly).
pony (Noun) — A small glass adequate to hold a single swallow of whiskey.
pony (Noun) — (informal) 25 pounds sterling.