n.
- (used with a sing. verb) Physics that deals with the relationships and conversions between heat and other forms of energy.
- (used with a pl. verb) Thermodynamic phenomena and processes.
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.