1.The act of feigning, inventing, or imagining; as, by a mere fiction of the mind.
2.That which is feigned, invented, or imagined; especially, a feigned or invented story, whether oral or written. Hence: A story told in order to deceive; a fabrication; opposed to fact, or reality. "The fiction of those golden apples kept by a dragon." "When it could no longer be denied that her flight had been voluntary, numerous fictions were invented to account for it."
3.Fictitious literature; comprehensively, all works of imagination; specifically, novels and romances. "The office of fiction as a vehicle of instruction and moral elevation has been recognized by most if not all great educators."
4.(Law) An assumption of a possible thing as a fact, irrespective of the question of its truth.
5.Any like assumption made for convenience, as for passing more rapidly over what is not disputed, and arriving at points really at issue.