Definition of gambling in the casinoslotsonlinefreeplay.review dictionary. Meaning of gambling. Information and translations of gambling in the most comprehensive dictionary. Definition of gambling: Betting (wagering) that must result either in a gain or a loss. Gambling is neither risk taking in the sense of speculation (assumption of. gambling meaning, definition, what is gambling: the activity of betting money, for example in a game or on a horse race. Learn more.