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U.S.S.R.

or USSR

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  1. Union of Soviet Socialist Republics.
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Union of Soviet Socialist Republics

noun
  1. a former federal union of 15 constituent republics, in E Europe and W and N Asia, comprising the larger part of the former Russian Empire: dissolved in December 1991. 8,650,069 sq. mi. (22,402,200 sq. km). Capital: Moscow. Abbreviation: U.S.S.R., USSR
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Also called Russia, Soviet Union.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for ussr

USSR

abbreviation for (formerly)
  1. Union of Soviet Socialist Republics
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Union of Soviet Socialist Republics

noun
  1. the official name of the former Soviet Union
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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 ussr

USSR

also U.S.S.R., initialism of Union of Soviet Socialist Republics, by 1926.

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Online Etymology Dictionary, © 2010 Douglas Harper

ussr in Culture

USSR

Abbreviation for Union of Soviet Socialist Republics, the official name of the former Soviet Union.

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Union of Soviet Socialist Republics

Official name of the former Soviet Union.

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.