Wiktionary:Word of the day/2006-05-24

act verb

1. To do something.

   When he must do something, he acts quickly.

2. To behave in a certain way.

   She acted strange when she danced and sang in the library.

3. To perform in a film or a play.

   Daniel Radcliffe acts in the Harry Potter films.

noun

1. Something done, a deed.

   Going into the house on fire to help a child was a brave act.

2. A law made by the government.

   The UK's Freedom of Information Act was passed in 2004.

3. False behavior, a pretense.

   Susan acts nice, but she is mean.

4. A part of a play or film.

   The curtain comes down at the end of each act.

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