'science fiction' definitions:

Definition of 'science fiction'

From: WordNet
noun
Literary fantasy involving the imagined impact of science on society

Definition of 'science fiction'

From: GCIDE
  • science fiction \sci"ence fic"tion\ (s[imac]"ens f[i^]k"sh[u^]n), n. [science fiction.] A genre of fiction in which scientific and technological issues feature prominently, especially including scenarios in which speculative but unproven scientific advances are accepted as fact, and usually set at some time in the future, or in some distant region of the universe. [PJC]

Synonyms of 'science fiction'

From: Moby Thesaurus