act A person who does something intentionally or with forethought acts or takes action. The word "act" can be used as a noun or as a verb. In these examples, "act" is a verb: - Bertha acted quickly when she learned she was in trouble.
- If you don’t act now, you’ll miss the opportunity to buy that car on sale.
- Dennis is acting strangely today. What’s wrong with him?
- That’s not the way a person in his position is supposed to act. He should resign.
- My computer is acting up again. I might have to take it in to get fixed. (act up = to misbehave)
In these examples, "act" is a noun: - Acts of kindness helped the tornado victims recover from the disaster.
- A terrible act of vandalism cost the homeowners thousands of dollars.
- In a final act of desperation, they kicked out the windows to escape from the fire.
- An Act of Congress becomes a law when it’s signed by the President. (an Act = a law in the United States)
The word "act" is also used for performers on a stage, in a theater, or in movies. This word can take on many different grammatical forms: He’s acting in a play.
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