noun

1. ACT, something that people do or cause to happen
2. ACT, a legal document codifying the result of deliberations of a committee or society or legislative body
3. ACT, a short performance that is part of a longer program
4. ACT, a subdivision of a play or opera or ballet
5. ACT, a manifestation of insincerity
6. ACT, something that is done
7. ACT, a law made by a group of legislators
8. ACT, one of the main divisions of a play or opera

verb

1. ACT, behave in a certain manner; show a certain behavior; conduct or comport oneself
2. ACT, pretend to have certain qualities or state of mind
3. ACT, discharge one's duties
4. ACT, play a role or part
5. ACT, perform on a stage or theater
6. ACT, behave unnaturally or affectedly
7. ACT, perform an action, or work out or perform (an action)
8. ACT, be engaged in an activity, often for no particular purpose other than pleasure
9. ACT, have an effect or outcome; often the one desired or expected
10. ACT, be suitable for theatrical performance
11. ACT, to do something : to take action
12. ACT, to behave in a particular way
13. ACT, to behave in a way that is not sincere or honest

1. We were grateful for her many acts of kindness.
2. the Civil Rights Act of 1964
3. Please read act II, scene 1 of Shakespeare's Romeo and Juliet.
4. He knew he had to act quickly.
5. The government was slow to act.
6. She acted on behalf of her father, who was not at the meeting.