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  1. not limited by conditions; absolute: an unconditional promise.
  2. Mathematics. absolute(def 12).
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Origin of unconditional

First recorded in 1660–70; un-1 + conditional
Related formsun·con·di·tion·al·ly, adverbun·con·di·tion·al·ness, un·con·di·tion·al·i·ty, noun


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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unconditional


  1. without conditions or limitations; totalunconditional surrender
  2. maths (of an equality) true for all values of the variable( x +1)> x is an unconditional equality
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Derived Formsunconditionally, adverbunconditionalness or unconditionality, noun
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 unconditional


1660s, from un- (1) "not" + conditional. Related: Unconditionally. Unconditional surrender in the military sense is attested from 1730; in U.S., often associated with Civil War Gen. Ulysses S. Grant and the taking of Fort Donelson.

The ringing phrase of Grant's latest despatch circulated through the North like some coinage fresh from the mint, and "Unconditional Surrender," which suited the initials of his modest signature, became like a baptismal name. [James Schouler, "History of the United States of America," Dodd, Mead & Co., 1899].
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Online Etymology Dictionary, © 2010 Douglas Harper