It refers to a point of time or space where multiple items
come together - flow together. It may be the combination of
rivers,
streets, or events in one's life.
It's amazing how you can see a border in the confluence between the Ohio and Mississippi rivers - and where the brown of the mississippi take over.
Oh, there's a strange confluence going on in my household -
the squid is learning how to drive, and the
she-wolf is expecting another child - let's top that off with my son
impregnating a girl.