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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. often capitalized a: a theological doctrine that all human beings will eventually be saved b: the principles and practices of a liberal Christian denomination founded in the 18th century originally to uphold belief in universal salvation and now united with Unitarianism.