Intensity is a widely-used term, which can mean:In colloquial use:StrengthAmplitudeLevelMagnitudeIn physics:Intensity , power per unit area (W/m2)Field strength of electric, magnetic, or electromagnetic fields (V/m, T, etc.)In optics:Radiant intensity, power per unit solid angle (W/sr)Luminous intensity, luminous flux per unit solid angle (lm/sr or cd)Irradiance, power per unit area (W/m2)