The intermodulation intercept point in electronics is a measure of an electrical device's linearity. When driven by two sinusoidal waveforms, it is the theoretical power level at which the power of the desired tone and the nth-order (where n is odd) intermodulation product intersect.
See also Second-order intercept point (IP2/SOI) Third-order intercept point (IP3/TOI) Fifth-order intercept point (IP5)
References