confluence \KON-floo-uhn(t)s, noun:
1. A flowing or coming together; junction.
2. The place where two rivers, streams, etc. meet.
3. A flocking or assemblage of a multitude in one place; a large collection or assemblage.
The subways are a strange confluence of people, all pressed up against you at 5:45pm. Guard your privates-nothing’s safe.