http://wordnet.princeton.edu/perl/webwn?s=act

# S: (n) act, enactment (a legal document codifying the result of deliberations of a committee or society or legislative body)
# S: (n) act, deed, human action, human activity (something that people do or cause to happen)
# S: (n) act (a subdivision of a play or opera or ballet)
# S: (n) act, routine, number, turn, bit (a short theatrical performance that is part of a longer program) "he did his act three times every evening"; "she had a catchy little routine"; "it was one of the best numbers he ever did"
# S: (n) act (a manifestation of insincerity) "he put on quite an act for her benefit"