fantasy

noun (plural fantasies)

• 1 [mass noun] the faculty or activity of imagining impossible or improbable things:his researches had moved into the realms of fantasy [as modifier]:a fantasy world
• [count noun] a fanciful mental image, typically one on which a person often dwells and which reflects their conscious or unconscious wishes:the notion of being independent is a child’s ultimate fantasy
• [count noun] an idea with no basis in reality:it is a misleading fantasy to suggest that the bill can be implemented
• a genre of imaginative fiction involving magic and adventure, especially in a setting other than the real world.

• 2 Music a fantasia.

verb (fantasies, fantasying, fantasied)

• imagine the occurrence of; fantasize about: it is ludicrous to fantasy ‘disinventing’ the hydrogen bomb