Just read this FAQ for the first time, and I thought I would list my favorite links & sources (which differ from those listed already) for book condition & book terminology glossaries, etc.
1. I highly recommend the series of book condition grading articles in the February through June 1998 issues of FIRSTS MAGAZINE. Back issues can be ordered through their website:
Link Now time for me to get to work!! Have a good day!
2. Thomas Lee's "20th Century First Edition Fiction: A Price and Identification Guide" is one of the best guides to condition grading I've come across so far. He devotes about eight pages to the subject, with specific examples (and he regularly sells the book on eBay for a very reasonable price).
3. I really like these two glossary links for book terminology & condition grading terminology:
Link Link 4. And a couple of Books that I recommend for terminology include:
ABC for Book Collectors by John Carter and,
The Encyclopedia of the Book by Geoffrey Glaister.
5. And, finally for novices or dabblers, a handy-dandy online first edition identification website for use until you get your own reference books:
Link 
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