[ uhn-bahy-uhst ]
/ ʌnˈbaɪ əst /


not biased or prejudiced; fair; impartial.
Also especially British, un·bi·assed.

Origin of unbiased

First recorded in 1600–10; un-1 + biased

Related forms

un·bi·ased·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unbiased

British Dictionary definitions for unbiased



/ (ʌnˈbaɪəst) /


having no bias or prejudice; fair or impartial
  1. (of a sample) not affected by any extraneous factors, conflated variables, or selectivity which influence its distribution; random
  2. (of an estimator) having an expected value equal to the parameter being estimated; having zero bias
  3. Also called: discriminatory (of a significance test). Having a power greater than the predetermined significance level

Derived Forms

unbiasedly or unbiassedly, adverbunbiasedness or unbiassedness, 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