Definitions from Wiktionary ( )

▸ verb:  (transitive) To form a mental image of something; to envision or create something in one's mind.
▸ verb:  (transitive) To believe in something created by one's own mind, often something false.
▸ verb:  (transitive) To assume; to suppose.
▸ verb:  (transitive) To conjecture; to guess.
▸ verb:  (transitive) To use one's imagination.
▸ verb:  (transitive, obsolete) To contrive in purpose; to scheme; to devise.
▸ verb:  (transitive, Internet slang, rhetorical, sarcastic) Used to mock an idea by suggesting that it is ridiculous or ill thought through.
▸ noun:  (fandom slang) A short fanfic or prompt placing a reader insert in a novel scenario with a character or celebrity.

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