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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.
An act may be a private act, done by an individual managing his or her personal affairs, or it may be a public act, done by an official, a council, or a court. When a bill is favorably acted upon in the process of legislation, it becomes an act.