Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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Necessary and Proper Clause the provision in the U.S. Constitution that Congress will have the power to make laws that are necessary and proper for executing the powers vested by the Constitution.
proper fraction a fraction in which the numerator is smaller or lower in degree than the denominator.
proper name see proper noun.
proper noun a capitalized noun that names a particular person, place, or thing. In the sentence, "I am from Russia," "Russia" is the proper noun.