imagine

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, often something false.

"She imagined that the man wanted to kill her."

To assume; to suppose.

"I imagine that he will need to rest after such a long flight."

To conjecture; to 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.

Used to mock an idea by suggesting that it is ridiculous or ill thought through.

"Imagine thinking that would work."

A short fanfic or prompt placing a reader insert in a novel scenario with a character or celebrity.