act

verb:to behave in a certain way; to perform an action
- You need to act quickly if you want to catch the train.
verb:to perform a fictional role in a play, film, or television production
- She was asked to act the part of the queen in the school play.
verb:to pretend; to behave insincerely
- He's not really upset; he's just acting.
verb:to function or serve as something
- This thick curtain can act as a barrier against the cold.
noun:a thing done; a deed
- It was an act of great bravery to run into the burning building.
noun:a law that has been passed by a legislative body
- The government passed an act to protect endangered species.
noun:a pretense; a display of behavior that is not genuine
- Her cheerful mood was just an act to hide her sadness.
noun:a main division of a play, opera, or ballet
- The hero dies in the final act of the tragedy.
noun:a short performance, such as in a circus or variety show
- The next act was a magician who performed incredible tricks.