Fantasy (noun)

1. An idea or image created by the imagination and not necessarily based on reality.
2. A genre of fiction that features magic or other supernatural elements as a main plot element, theme, or setting.

Origin:

Late middle english: from old french fantasie, or via latin from greek phantasia "imagination", from phantazein "make visible".

Examples:

1. His vivid imagination conjured up all sorts of fantastic fantasy.
2. The novel was a fantasy about a magical land.
3. Her fantasy was to live on a tropical island.
4. The movie was a fantasy about a dragon and a knight.
5. The game was a fantasy role-playing game.