act (Noun) — Something that people do or cause to happen.
act (Noun) — (law) a legal document codifying the result of deliberations of a committee, society or legislative body.
act (Noun) — A subdivision of a play, opera or ballet.
act (Noun) — A short theatrical performance that is part of a longer program. ex. "he did his act three times every evening"
act (Noun) — A manifestation of insincerity. ex. "he put on quite an act for her benefit"
act (Verb) — Perform an action; do something. ex. "think before you act" ex. "The governor should act on the new energy bill" ex. "The nanny acted quickly by grabbing the toddler and covering him with a wet towel"
act (Verb) — Show a certain behaviour; conduct or comport oneself. ex. "You should act like an adult" ex. "The dog acts ferocious, but he is really afraid of people"
act (Verb) — (performing arts) Perform a role or part. ex. "She wants to act Lady Macbeth, but she is too young for the role"
act (Verb) — Discharge one's duties. ex. "She acts as the chair" ex. "In what capacity are you acting?"
act (Verb) — Pretend to have certain qualities or state of mind. ex. "He acted the idiot"
act (Verb) — Be suitable for theatrical performance. ex. "This scene acts well"
act (Verb) — Have a desired or expected effect or outcome. ex. "The breaks of my new car act quickly"
act (Verb) — Be engaged in an activity, often for no particular purpose other than pleasure.
act (Verb) — Behave unnaturally or affectedly. ex. "She's just acting"
act (Verb) — (dramaturgy) perform on a stage or theatre. ex. "She acts in this play" ex. "He acted in 'Julius Caesar'"