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|Noun||1.||Weber's law - (psychophysics) the concept that a just-noticeable difference in a stimulus is proportional to the magnitude of the original stimulus; "Weber's law explains why you don't notice your headlights are on in the daytime"|
law of nature, law - a generalization that describes recurring facts or events in nature; "the laws of thermodynamics"
psychophysics - the branch of psychology concerned with quantitative relations between physical stimuli and their psychological effects