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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.
Noun. 1. terrorist act-the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coercion or instilling fear. act of terrorism, terrorism.rightening, terrorisation, terrorization-the act of inspiring with fear. terrorist attack-a surprise attack involving the deliberate use of violence against civilians in the hope of attaining political or religious aims.