To write under the name of another (especially literary works).
To author a literary work or speech in the place of another.
To form a mental image of something; to envision or create something in one's mind.
to assume
to use one's imagination
To believe in something created by one's own mind.
to conjecture or guess
Used to mock some idea.
A short fanfic or prompt placing a reader insert in a novel scenario with a character or celebrity.