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Meaning of back order

back' or"der

Pronunciation: [key]
  1. an order or part of an order waiting to be filled.

back-or•der

Pronunciation: (bak'ôr"dur), [key]
— v.t.
  1. to treat as a back order: We have to back-order your sofa until the new fabric arrives.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.