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interdepartmental

[in-ter-dee-pahrt-men-tl, -di-pahrt-]
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adjective
  1. involving or existing between two or more departments:interdepartmental rivalry.
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Origin of interdepartmental

First recorded in 1890–95; inter- + departmental
Related formsin·ter·de·part·men·tal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for interdepartmentally

interdepartmental

adjective
  1. of, relating to, or conducted between two or more departments
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for interdepartmentally

interdepartmental

adj.

also inter-departmental, 1861, from inter- + departmental.

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Online Etymology Dictionary, © 2010 Douglas Harper