1. force¹ noun, strength or energy; might; power
2. force² noun, (in northern England) a waterfall
3. strong interaction or force noun, physics an interaction between elementary particles responsible for the forces between nucleons in the nucleus. It operates at distances less than about 10^–15 metres, and is about a hundred times more powerful than the electromagnetic interaction. Also called: strong nuclear interaction or force. See interaction
4. weak interaction or force noun, physics an interaction between elementary particles that is responsible for certain decay processes, operates at distances less than about 10^–15 metres, and is 10¹² times weaker than the strong interaction. The weak interaction and electromagnetic interactions are now described by the unifying electroweak theory. Also called: weak nuclear interaction or force. See interaction, electroweak interaction
5. (and 21 more)

By Defined by Harper Collins 

Collins English Electronic Dictionary - Digital Edition: 2008 © HarperCollins Publishers 2008

1. the force of the blow
2. a gale of great force
3. electromotive force
4. coercive force
5. he was a force in the land

Synonyms

strength, life, strength, compulsion, pressure, violence, enforce, constraint, oppression, coercion

Antonyms

weakness, coax