n.
- The act or process of making or becoming thick.
- Material used to thicken: stir in a thickening of flour and water.
- A thickened part.
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.