SF adjective 1noun 6forms 1 adjective1 •Initialism of smoker-friendly: not objecting to people who smoke tobacco. noun6 •Initialism of science fiction or speculative fiction, often used to avoid having to choose between the two. •Initialism of square feet. •Abbreviation of semifinal. •Initialism of single female. •Initialism of small forward. •Initialism of spontaneous fission. formsSFs