u. n

UN

United Nations ( def 1 ).
Also, U.N.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
UN
 
abbreviation for
United Nations

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

un-
prefix of negation, O.E. un-, from P.Gmc. *un- (cf. O.Fris., O.H.G., Ger. un-, Goth. un-, Du. on-), from PIE *n- (cf. Skt. a-, an- "not," Gk. a-, an-, O.Ir. an-, L. in-), a variant of PIE base *ne- "not" (cf. Avestan na, O.C.S., Lith. ne "not," L. ne "that not," Gk. ne- "not," O.Ir. ni, Corn. ny "not").
Freely and widely used since O.E. times in compounds with native and imported words, it disputes with Latin-derived cognate in- the right to form the negation of certain words (indigestable/undigestable, etc.). Often euphemistic (e.g. untruth for "lie"). The most prolific of Eng. prefixes, it even is used to make words from phrases (e.g. uncalled-for, 1610; undreamed-of, 1636; uncome-at-able, 1694; unputdownable, 1947, of a book). As a prefix in telegram-ese to replace not and save the cost of a word, it is first attested 1936.

un-
prefix of reversal (e.g. unhand, undo, unbutton), O.E. on-, un-, from P.Gmc. *andi- (cf. O.S. ant-, O.N. and-, Du. ont-, O.H.G. ant-, Ger. ant-, Goth. and- "against"), from PIE *anti "facing opposite, near, in front of, before" (see ante).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

un- 1
pref.
Not: unmyelinated.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
un
unit
UN
  1. United Nations

  2. until (shortwave transmission)

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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