A short fanfic or prompt placing a reader insert in a novel scenario with a character or celebrity.
To form a mental image of something; to envision or create something in one's mind.
Try to imagine a pink elephant.
To believe in something created by one's own mind.
She imagined that the man wanted to kill her.
To assume
I imagine that he will need to rest after such a long flight.
To conjecture or guess
I cannot even imagine what you are up to!
To use one's imagination
Imagine that we were siblings.
To contrive in purpose; to scheme; to devise.