Fiction with a large amount of imagination in it WordNet 3.0 & Open English WordNet

Fantasy is a genre of speculative fiction involving magical elements, typically set in a fictional universe and usually inspired by mythology or folklore. Wikipedia

Genre of fiction. Wikipedia Disambiguation

Genre of speculative fiction set in a fictional universe, often inspired by real world myth and folklore Wikidata

A situation imagined by an individual that expresses certain desires or aims on the part of its creator. Fantasies sometimes involve situations that are highly unlikely; or they may be quite realistic. Another, more basic meaning of fantasy is something which is not 'real,' as in perceived explicitly by any of the senses, but exists as an imagined situation of object to subject. OmegaWiki

The literary genre generally dealing with themes of magic and the supernatural, imaginary worlds and creatures, etc. Wiktionary

Literary genre. Wiktionary (translation)