QUANTUM By N., Pam M.S. - April 28, 2013 In physics, a unit of radiant energy. 2. The minimum amount of neurotransmitter released by a neuron at a given time (in neuroscience). QUANTUM: "A quantum leap Is actually referred to as a quantum jump." Related Psychology Terms RCUPTAKC PRESYNAPTIC CALORIE CALORIE CATECHOLAMINERGIC NEURON BASAL METABOLISM NEUROMUSCULAR JUNCTION NEUROLOGY, NEUROPHYSIOLOGY, AND NEUROPHARMACOLOGY, NEUROTRANSMISSION SPREADING ACTIVATION Cite this page: N., Pam M.S., "QUANTUM," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/quantum/ (accessed February 25, 2020).