term:

Necessary And Proper Clause

necessary and proper clause n

often cap N&P&C
[from the words of the clause]
: the clause in Article I, Section 8 of the U.S. Constitution that empowers the Congress to make all laws necessary for executing its other powers and those of the federal government as a whole

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.