Quid pro quo --- A Latin phrase meaning literally, "What for what." The phrase describes an implied or expressed expectation that one party will get something for smeting else given up. "Quid pro quo sexual harassment, for example, is the most overt form of harassment in which the harasser makes it clear that failure to submit to the sexual demands will result in loss of employment or some other right, opportunity or benefit.
Quorum -- The minimal number of officers and members of a committee or organization, usually a majority, who must be present for valid transaction of business.