Real Dictionary

conflict
Conflict is serious disagreement and argument about something important. If two people or groups are in conflict, they have had a serious disagreement or argument and have not yet reached agreement.
uncountable noun: Conflict is a state of mind in which you find it impossible to make a decision.
variable noun: A conflict is a serious difference between two or more beliefs, ideas, or interests. If two beliefs, ideas, or interests are in conflict, they are very different.
variable noun: Conflict is fighting between countries or groups of people.

conflict in American English
to fight; battle; contend
intransitive verb: to come into collision or disagreement; be contradictory, at variance, or in opposition; clash
noun: a fight, battle, or struggle, esp. a prolonged struggle; strife

conflict in British English
noun: a struggle or clash between opposing forces; battle
verb: to come into opposition; clash