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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.
Ev. Sec. 113. ACT, legislation. A statute or law made by a legislative body; as an act of congress is a law by the congress of the United States; an act of assembly is a law made by a legislative assembly.v. Sec. 113. ACT, legislation. A statute or law made by a legislative body; as an act of congress is a law by the congress of the United States; an act of assembly is a law made by a legislative assembly.