paperback

Definitions

General English

Information & Library Science

  • adjective with a thin flexible cover, instead of a hard cover
  • noun a book with a paper or light card cover

Media Studies

  • noun a book with a soft flexible cover, often cheaper and in a smaller format than a hardback.

Publishing

  • verb to publish a book in a paperback edition
http://www.dictionarycentral.com/definition/paperback.html