Origins
Fiction is sculpture. The word descends from Latin fingere, meaning 'to shape, to form, to mould' — the same verb a Roman potter used for working clay. Fictiō was the act of shaping, and by extension, the act of inventing.
The metaphor is precise. A fiction is not simply a lie; it is a shaped thing. A novelist moulds characters from raw imagination the way a sculptor moulds figures from raw stone. Both create form where none existed. This is why fiction carries more dignity than falsehood — the Latin root honours the craft involved.
The PIE root *dʰeyǵʰ- meant 'to knead' or 'to form'. Through the Germanic branch, it produced dough — something kneaded into shape. Through Latin fingere, it produced fiction, figure, figment, feign, and effigy. The family spans the entire spectrum from physical making to pure invention.
Later History
Feign is fiction's verb form: to feign illness is to shape a fiction with your body. Figment keeps the sense of something imagined into existence. Effigy preserves the physical meaning: a shaped likeness.
When English borrowed the word via Old French in the 14th century, fiction meant both 'an invented story' and 'deception'. The literary sense — fiction as a genre — solidified only in the 16th century, distinguishing shaped imagination from simple lying.