The Oxford English Dictionary (OED) seeks to include all English words that are used frequently, including historical citations of their uses. Science fiction works and sci fi/SF criticism/fandom are no exceptions, and you can help with earlier, later, and intermediate examples of use (newest additions).
Now Oxford University Press has come out with a book:
Brave New Words: The Oxford Dictionary of Science Fiction by Jeff Prucher (UK publisher site, US publisher site).
Words now used by the mainstream sometimes come from science fiction. Did anyone use the word cyberspace before author William Gibson in 1982? The OED wants to know.