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Meaning of open-stack

o•pen-stack

Pronunciation: (ō'pun-stak'), [key]
— adj. Library Science.
  1. having or being a system of library management in which patrons have direct access to stacks for browsing and selecting books; open-shelf. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.