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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.
ACT -- Legislation enacted into law. A bill that has passed both houses of the legislature, been enrolled, ratified, signed by the governor or passed over the governor's office, and printed. It is a permanent measure, having the force of law until repealed. 1  Local act -- Legislation enacted into law that has limited application. 2  Private act -- Legislation enacted into law that has limited application.  Public act -- Legislation enacted into law that applies to the public at large.