paperback
US /ˈpeɪ.pɚ.bæk/
UK /ˈpeɪ.pɚ.bæk/

1.
a book with a flexible paper cover, typically a less expensive edition of a hardback
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I prefer reading paperbacks because they are lighter to carry.
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The novel was first released in hardback, then later as a paperback.
1.
having a flexible paper cover
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The new edition will be available in both hardback and paperback formats.
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She bought a cheap paperback novel for her trip.