Meaning of mass market paperback

mass' mar"ket pa'perback

Pronunciation: [key]
  1. a relatively inexpensive paperbound book, typically measuring about 4 × 7 in. (11 × 18 cm), that is distributed on newsstands, in supermarkets, etc., as well as in bookstores.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.