AMPLITUDE By N., Pam M.S. - April 7, 2013 noun. 1. the size of a stimulant or reaction. 2. the highest worth of a sinusoid wave. AMPLITUDE: "The amplitude of the results was far stronger than anyone expected." Related Psychology Terms AMPLITUDE OF LIGHT WAVE COUNTERCONDITIONING CONDITIONED REFLEX, CONDITIONED STIMULUS (CS) THRESHOLD TUNING CURVE PREPULSE INHIBITION UNCONDITIONED RESPONSE (UCR UR) CONDITIONED SUPPRESSION PAVLOVIAN CONDITIONING CONTRACTILITY Cite this page: N., Pam M.S., "AMPLITUDE," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/amplitude/ (accessed January 19, 2020).