An Act

1. (countable) Something done, a deed.
2. (obsolete, uncountable) Actuality.
3. (theology) Something done once and for all, as distinguished from a work.
4. (countable) A product of a legislative body, a statute.
5. (countable) A formal or official record of something done.
6. (countable, drama) A division of a theatrical performance.
7. (countable) A performer or performers in a show.
8. (countable) Any organized activity.
9. (countable) A display of behavior.
10. A thesis maintained in public, in some English universities, by a candidate for a degree, or to show the proficiency of a student.
11. (countable) A display of behaviour meant to deceive.

Synonyms

• (something done): deed; see also action
• (product of a legislative body): statute
• (display of behavior): pretense