noun

1. Something done, a deed.

   “an act of goodwill”

2. Actuality.

3. Something done once and for all, as distinguished from a work.

Synonyms: pretense, statute, deed

verb

1. To do something.

   “If you don't act soon, you will be in trouble.”

2. To do (something); to perform.

3. To perform a theatrical role.

   “I started acting at the age of eleven in my local theatre.”