Entry 2 senses · 2 variants Webster, 1913 paperback /(pā"pẽr*băk`)/ · pa·per·back · IPA /ˈpeɪ.pɚˌbæk/ n. adj. 01 n. A book with paper covers; -- contrasted with hardback or hardcover. 1. A book with paper covers; -- contrasted with hardback or hardcover. Syn. softback, soft-cover. 02 adj. having a flexible binding; -- of books. Contrasted to hardcover or hardbacked or hardbound. 1. having a flexible binding; -- of books. Contrasted to hardcover or hardbacked or hardbound. Syn. paperbacked, soft-bound, softcover, softback.