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Used attributive with reference to Racah's work in quantum mechanics; specifically "Racah coefficient"noun either of two coefficients representing electrostatic interactions within a system of equivalent charged particles, especially electrons within an atom; "Racah parameter"noun = "Racah coefficient".
1950s; earliest use found in The Physical Review. From the name of Giulio Racah, Italian-born Israeli physicist, whose work on spectra gave rise to the coefficients.
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