That which is essential, suitable, adapted, and correct. 2. Congress is authorized by art, 1, s. 8, of the constitution of the United States, to make all laws which shall be necessary and proper, for carrying into execution the foregoing powers, and all other powers vested by this constitution of the United States, in any department. or officer thereof. See Necessary and Proper.
Law Dictionary – Alternative Legal Definition
That which is fit, suitable, adapted, and correct. Peculiar; naturally or essentially belonging to a person or thing; not common; appropriate; one’s own. Proper feuds. In feudal law, the original and genuine feuds held by purely military service. Proper parties. A proper party, as distinguished from a necessary party, is one who has an interest in the subject matter of the litigation, which may be conveniently settled therein; one without whom a substantial decree may be made, but not a decree which shall completely settle all the questions which may be involved in the controversy and conclude the rights of all the persons who have any interest in the subject of the litigation.