sci-fi
This term is a clipped form of science fiction and is significantly more casual than its full counterpart. While science fiction is used in academic, literary, or formal critical contexts, sci-fi is the standard choice for everyday conversation, marketing, and informal reviews.
As a noun, it refers to the genre as a whole. As an adjective, it describes the aesthetic or thematic elements of a work. It is rarely used in highly formal scholarly writing unless the author is specifically discussing the popular culture aspect of the genre.
Meanings
A genre of speculative fiction that typically deals with imaginative and futuristic concepts such as advanced science and technology, space exploration, time travel, parallel universes, and extraterrestrial life.
I have always been a huge fan of hard sci-fi.