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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.
1 Capitalize common nouns --such as road, river, and republic --only when they're part of the full name of a place. 2  Don't capitalize these common nouns when they stand alone in follow-up references.