The Oxford English Dictionary is brilliant for finding examples of how words have been used in literature, but it’s not so hot for science fiction and network terms. The digital meaning of “avatar” isn’t in there at all, for instance. To remedy this, volunteers, fans and OED freelancers are collecting citations of the usage of science fiction terms, asking for information from all of us, and hoping to incorporate some of this material in future editions of the OED. If you’re curious about a word Science Fiction Citations is a useful, though incomplete, source. Or perhaps you’d just like to browse?