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"
perform on a stage or theater; "She acts in this play"; "He acted in `Julius Caesar'"; "I played in `A Christmas Carol'"
behave unnaturally or affectedly; "She's just acting"
perform an action, or work out or perform (an action); "think before you act"; "We must move quickly"; "The governor should act on the new energy bill"; "The nanny acted qui
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"