Term coined by Carl Jung for the phenomenon of an apparent pattern of coincidental events which, while lacking any causal relationship, bear a meaningful relationship to the observer.
Example: A hot air balloon makes an emergency landing in your yard just as you're imagining what it's like to ride one.
I can't believe there is not a single reasonably correct and straight-forward definitionprovided for "synchronicity" here.
A real life to dream relation. To have a connection or think something has happened before. Very similar to deja vu or to know something in a dream before it actually happens in real life.
Girl 1: I think I have synchronicity!
Girl 2: wait isn't that when you know what is going to happen in real life because it has happened to you in a dream!!!
Girl 1: BINGO ☺