rubbing : Abrasion or wear to the surface. Usually used in reference to a book's boards or dust-jacket.

vg : Very Good condition. can describe a used book that does show some small signs of wear - but no tears - on either binding or paper. Any defects must be noted. (defined by AB Bookman's Weekly)

trade paperback : Often used to indicate any paperback book that is somewhat larger than a mass-market paperback.

reprint : Any printing of a book which follows the original edition. By definition, a reprint is not a first edition.