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um

[uhm, uhn, uhm, uhn]
–interjection
(used as an expression of doubt, hesitation, deliberation, interest, etc.)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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um also umm   (ŭm, əm)   
interj.  Used to express doubt or uncertainty or to fill a pause when hesitating in speaking.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

um 
a sound denoting hesitation, 1672.
Online Etymology Dictionary, © 2001 Douglas Harper
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Computing Dictionary

um networking
The country code for United States minor outlying islands.
(1999-01-27)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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Abbreviations & Acronyms
UM
University of Michigan
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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