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The word act, as used in the term Act of Congress, is a common, not a proper noun. The capitalization of the word act is deprecated by some dictionaries and usage authorities. Some writers, in particular the U.S. Code, capitalize Act.
Definition of capitalization. 1  1a : the act or process of capitalizingb : a sum resulting from a process of capitalizingc : the total liabilities of a business including both ownership capital and borrowed capitald : the total par value or the stated value of no-par issues of authorized stock. 2  2 : the use of a capital letter in writing or printing.