1.
The world or the state of things as they actually exist, as opposed to an idealistic or notional idea of them..
2. A thing that is actually experienced or seen, esp. when this is grim or problematic.
3. Something that is neither derivative nor dependent but exists necessarily.
You're in for a surprise, because right now, you're in my reality, and my reality needn't consist of that which is real. I hope you survive here and have a good day.