1. Temporarily assuming the duties or authority of another. See synonyms at temporary.
2. 1. That contains directions for use in a dramatic performance: the play's acting text.
   2. That is appropriate for dramatic performance: an acting comedy.

1. The occupation of an actor or actress.
2. Performance as an actor or actress.
3. False behavior; pretense.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.