Meaning of “war” - Learner’s Dictionary

war

noun us uk /wɔːr/
The southern coast was heavily mined during the war.The war had a profound impact on people's lives.The whole area has been ravaged by war.The factories were bombed during the war.These talks do not look likely to end the war.
FIGHTING [ C, U ]

A2 fighting, using soldiers and weapons, between two or more countries, or two or more groups inside a country:

They've been at war for the past five years.
He was only a child when the war broke out (= started).
If this country goes to war (= starts to fight in a war), thousands of people will die.
COMPETING [ C, U ]

a situation in which two or more groups are trying to be more successful than each other:

a price war between supermarkets
TO STOP [ no plural ]

an attempt to stop something bad or illegal:

the war against crime/drugs
→ See also civil war , prisoner of war , world war

(Definition of “war” from the Cambridge Learner’s Dictionary © Cambridge University Press)