Learner's definition of POSSIBLY
1 — used to say something might happen, exist, or be true but is not certain
The exam will probably take you the whole hour to complete, possibly [=perhaps, maybe] even longer.
The doctor says I might possibly regain full use of my hand.
The fire could possibly have been caused by faulty wiring.
It's possibly the worst movie I've ever seen.
“Is it going to rain?” “Quite possibly.”
2 — used to show shock or surprise at something 3 — used to ask for something politely 4 — used to say that someone will do or has done everything that can be done to achieve something
I will come as soon as I possibly can.
I did all I possibly could to get here on time, but I got caught in traffic.
5 — used in negative statements to emphasize that something cannot or could not happen or be done
I can't possibly tell you that. It's a secret.
You couldn't possibly understand what I'm going through.
You could not have possibly finished your homework in such a short amount of time.