science_fiction has definitions from the field of writing
[ noun ] (writing) literary fantasy involving the imagined impact of science on society

Used in print

(Nathan Rapport, ""I've Been Here before!"...)

It is not through space nor time that the time_machine most approved by science_fiction must travel for a visit to the permanent prehistoric past , or the ever existent past fantasy future .

(James Thurber, "The Future, If Any, of Comedy,"...)

`` The human ego being what it is '' , I put_in , `` science_fiction has always assumed that the creatures on the planets of a_thousand larger solar_systems than ours must look_like gigantic tube-nosed_fruit_bats .