What is supply variation rejection (SVR) of an operational amplifier?

SVR is the ratio of the power supply voltage to the varied input offset voltage when the input offset voltage has changed due to a change in the power supply voltage.
SVR expresses the extent to which power supply ripple or noise can be suppressed in the device.

SVR=Δ(V⁺-V^-)/ΔV_IO

Example) SVR in the uPC801 is 76 dB (typ). From this it can be calculated that when the SVR is 6.3 × 10³ and the power supply voltage varies temporarily by 0.5 V due to external disturbance, V_IO varies by 79 μV.