Definitions for just-noticeable difference
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Princeton's WordNet
just-noticeable difference, jnd(noun)
(psychophysics) the difference between two stimuli that (under properly controlled experimental conditions) is detected as often as it is undetected
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"just-noticeable difference." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/just-noticeable difference>.