What is a conflict.

verb (used without object)

1. to come into collision or disagreement; be contradictory, at variance, or in opposition; clash:

2. to fight or contend; do battle.

noun

3. a fight, battle, or struggle, especially a prolonged struggle; strife.

controversy; quarrel:

4. discord of action, feeling, or effect; antagonism or opposition, as of interests or principles:

5. a striking together; collision.