Originally Posted by Fletch XXX

fan⋅ta⋅sy
1. imagination, esp. when extravagant and unrestrained.
2. the forming of mental images, esp. wondrous or strange fancies; imaginative conceptualizing.
3. a mental image, esp. when unreal or fantastic; vision: a nightmare fantasy.
4. Psychology. an imagined or conjured up sequence fulfilling a psychological need; daydream.
5. a hallucination.