SpeculativeFiction is an umbrella term I like to use because it includes all the forms of fantastic fiction or what for ages has been called science fiction and fantasy.
In SpeculativeFiction the action of the story can take place in a culture that never existed, a world we know nothing of, or an earth that might have been or might be, to name a few.
SpeculativeFiction is a term that has not been embraced entirely by the writers, editors, and critics in the science fiction, fantasy and horror fields.
Speculativefiction is a term which has been used in multiple related but distinct ways.
For example, in Harlan Ellison's writing, the term may signal a wish not to be pigeonholed as a science fiction writer, and a desire to break out of science fiction's genre conventions in a literary and modernist direction.
The use of "speculativefiction" in the sense of expressing dissatisfaction with science fiction was popularized in the 1960s and early 1970s by Judith Merril and other writers and editors, in connection with the New Wave movement.