from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A contrary or opposing force, especially a military force capable of destroying the nuclear armaments of an enemy.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A force that opposes another force.
from the GNU version of the Collaborative International Dictionary of English
- n. An opposing force.
counter- + force (Wiktionary)