GVF (Gas Volume Fraction or Gas Void Fraction) is given at the pressure and temperature of interest (for example at suction conditions in a multi phase pump application) whereas GOR is always referred to normal pressure and temperature conditions.
The term GVF (Gas Void Fraction) is used to express the fraction of the volume occupied by gas in a gas liquid mixture at any given pressure and temperature condition.
I otherwise agree with the definitions of GLR and GOR presented before
