Available Definitions:
1) n. - The act of feigning, inventing, or imagining; as, by a mere fiction of the mind.
2) n. - 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.
3) n. - Fictitious literature; comprehensively, all works of imagination; specifically, novels and romances.
4) n. - An assumption of a possible thing as a fact, irrespective of the question of its truth.
5) n. - Any like assumption made for convenience, as for passing more rapidly over what is not disputed, and arriving at points really at issue.