Noun | 1. | ![]() radio brightness - the strength of a radio wave picked up by a radio telescope magnitude - the property of relative size or extent (whether large or small); "they tried to predict the magnitude of the explosion"; "about the magnitude of a small pea" threshold level - the intensity level that is just barely perceptible field intensity, field strength - the vector sum of all the forces exerted by an electrical or magnetic field (on a unit mass or unit charge or unit magnetic pole) at a given point in the field candlepower, light intensity - luminous intensity measured in candelas acoustic power, sound pressure level - the physical intensity of sound half-intensity - half the maximum intensity |