Wordnet 3.0
NOUN (1)
1.
(psychophysics) the difference between two stimuli that (under properly controlled experimental conditions) is detected as often as it is undetected;
[syn: just-noticeable difference, jnd]
WordNet (r) 3.0 (2006):
jnd
n 1: (psychophysics) the difference between two stimuli that
(under properly controlled experimental conditions) is
detected as often as it is undetected [syn: just-
noticeable difference, jnd]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
JND
Just Noticeable Difference (video)