Definition of activation energy
: the minimum amount of energy required to convert a normal stable molecule into a reactive molecule
Test Your Vocabulary
Challenging Words You Should Know
-
- Often used to describe “the march of time,” what does inexorable mean?

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share activation energy
Time Traveler for activation energy
The first known use of activation energy was in 1924
See more words from the same year