WordReference Random House Unabridged Dictionary of American English © 2015
back office, 
Stock Exchangeany department or office, as a private office or a department of record keeping, that is not usually seen by outsiders.

Collins Concise English Dictionary © HarperCollins Publishers::

back office n
  1. the administrative and support staff of a financial institution or other business
  2. (as modifier): back-office operations

'back office' also found in these entries:

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