B1
If something is possible, it might or might not exist or be true.
Dictionary examples:
It's possible my cat is secretly a spy for the mice. (0.0)
Is it possible that my phone is hiding from me on purpose? (0.0)
Is it possible that my socks are eating each other in the washing machine? (0.0)
"Do you think he'll end up in prison?" "It's very possible." (11.9)
That's one possible solution to the problem. (15.5)
It's possible (that) Mira might turn up tonight. (16.3)