probability amplituden.Physics the amplitude of the wave function of a particle, equal to the square of the function and representing the probability of the particle's being in a given volume element.
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1927 Proc. National Acad. Sci. U.S.A.13 803 What we want to know is the probability amplitude of j, k, s, jz = m.
2001 R. Gregory in R. Catlow & S. Greenfield Cosmic Rays 57 The probabilities of events are given by the squares of the lengths of the arrows, called the ‘probability amplitude’.