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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.
Usage notes [edit]. The feminine noun acta is like other feminine nouns starting with a stressed a sound in that it takes the definite article el (normally reserved for masculine nouns) in the singular when there is no intervening adjective: