from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The rate of decrease of atmospheric temperature with increase in altitude.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The rate of change in atmospheric temperature with increase of height. The variable normally is temperature unless specified otherwise. This is a vertical direction of travel (up or down), and the temperature may rise or fall suddenly.
Sorry, no etymologies found.