n the act of accomplishing (an obligation); performance
n the act of expelling or letting go
n (electricity) the act of releasing an accumulated charge
n (medicine) the act of releasing an inpatient from hospital
n (military) the act of releasing a member of the armed forces from service
n (hydrology) the discharge of a river is the volume of water transported by it in a certain amount of time, usually in units of m3/s (cubic meters per second)