7a604b23_agement_and_Telecommunications_Glossary_Definition
[Term] Active average power (single phase) [Definition] 
The time average of the values of active power when the active power varies slowly over a specified period of time. This situation is normally encountered because electric system voltages or currents or both are regularly quasi-periodic. The average active power is readily obtained by dividing the energy flow during the specified period of time, by the time.
RSS-Gen — General Requirements for Compliance of Radio Apparatus - Spectrum Management and Telecommunications