Collision

Part of speech: noun (n.)

1. The act of striking together; a striking together, as of two hard bodies; a violent meeting, as of railroad trains; a clashing.

2. A state of opposition; antagonism; interference. The collision of contrary false principles. Bp. Warburton. Sensitive to the most trifling collisions. W. Irving.

Synonyms: Conflict; clashing; encounter; opposition.