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qui tam adj
[Late Latin, who as much, who as well; from the first words of a clause referring to the plaintiff as one who sues as much for the state as for himself or herself]
: of, relating to, or being a qui tam action [a qui tam plaintiff]
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.