Legal Definition of qui tam
: of, relating to, or being a qui tam action <a qui tam plaintiff>
Origin and Etymology of qui tam
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
Learn More about qui tam
Dictionary: Definition of qui tam
Seen and Heard
What made you want to look up qui tam? Please tell us where you read or heard it (including the quote, if possible).