1. the process of becoming thick or thicker
2. a substance used to make liquids thicker
Usage: cooking
3. an area that has become thick or swollen
Usage: medical

1. present participle of thicken

Examples

• The thickening of the sauce took about ten minutes.
• Add cornstarch as a thickening agent to the soup.
• The doctor noticed a thickening of the artery walls.
• The fog is thickening as evening approaches.
• She observed the thickening crowd at the concert entrance.
• The plot is thickening with each new revelation.
• Flour works well as a thickening for gravies.