noun
: the intensity of a sound in a specified direction measured by the average rate at which sound energy passes through a unit area normal to that direction and commonly expressed in ergs per second per square centimeter
noun
: the intensity of a sound in a specified direction measured by the average rate at which sound energy passes through a unit area normal to that direction and commonly expressed in ergs per second per square centimeter
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012