Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The principle stating that for every action there is an equal and opposite reaction. Thus, if one body exerts a force F on a second body, the first body also undergoes a force of the same strength but in the opposite direction.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics Newton's observation that to every
action (force applied) there is anequal butopposite reaction (equal force applied in the opposite direction)
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[After Isaac Newton.]
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