(uncountable) A genre of movies featuring mostly fictional scientific scenes.
Several sci-fi films and novels have very accurately predicted and paved the way for many of the pieces of technology we enjoy today. 2015 August 13, Emmanuel Tsekleves, “Science fiction as fact: how desires drive discoveries”, in The Guardian, archived from the original on 18 Jun 2016:
I'm the kind of sci-fi addict who can stand any amount of improbability, bad acting, uninterested direction and poverty-row budgets, but can't take The Mind of Mr. Soames. 1970, National Board of Review of Motion Pictures (contributor), Films in Review, volume 21, page 571:
(colloquial, uncountable) Syllabic abbreviation of science fiction.