Confluence

con·flu·ence (knfl-ns)
n.
1.
a. A flowing together of two or more streams.
b. The point of juncture of such streams.
c. The combined stream formed by this juncture.
2. A gathering, flowing, or meeting together at one juncture or point: "A confluence of negative events conspired to bring down bond prices" (Michael Gonzalez).

http://www.thefreedictionary.com/confluence