Here are two good resources for looking up acronyms:
- AcronymFinder.com—The site is self-explanatory, but it doesn’t have every acronym.
- Google—Search for the acronym you’re struggling to define and, if it’s not just something an author invented, it’ll be here. Somewhere. Of course, many acronyms have multiple meanings. But if you search for the acronym and include other keywords, such as the author’s name or the subject, you’ll probably find the definition.