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Retardation factor, in chromatography, the fraction of an analyte in the mobile phase of a chromatographic system •
Retarded potential, in electrodynamics, electromagnetic potentials generated by time-varying electric current or charge distributions in the past •
Retarded time, time when an electromagnetic field began to propagate from a point in a charge distribution to an observer •
Retardation time • Retardation, in telegraphy, a kind of distortion of signal pulses; see
law of squares • Retardation, as opposed to
acceleration ==Music==