behave in a certain manner; show a certain behavior; conduct or comport oneself; "You should act like an adult"; "Don't behave like a fool"; "What makes her do this way?"; "The dog acts ferocious, but he is really afraid of people"
pretend to have certain qualities or state of mind; "He acted the idiot"; "She plays deaf when the news are bad"
discharge one's duties; "She acts as the chair"; "In what capacity are you acting?"
play a role or part; "Gielgud played Hamlet"; "She wants to act Lady Macbeth, but she is too young for the role"; "She played the servant to her husband's master"
something that people do or cause to happen
perform on a stage or theater; "She acts in this play"; "He acted in `Julius Caesar'"; "I played in `A Christmas Carol'"
a legal document codifying the result of deliberations of a committee or society or legislative body
behave unnaturally or affectedly; "She's just acting"
undergo a chemical reaction; react with another substance under certain conditions; "The hydrogen and the oxygen react"
show a response or a reaction to something
act against or in opposition to; "She reacts negatively to everything I say"