dark energy
noun
Definition of dark energy
: a hypothetical form of energy that produces a force that opposes gravity and is thought to be the cause of the accelerating expansion of the universe
Read the Latest from M-W
1998
First Known Use of dark energy
1998
Seen and Heard
What made you want to look up dark energy? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!