feed back Definition

the transmission of evaluative or corrective information about an action, event, or process to the original or controlling source; also : the information so transmitted

the partial reversion of the effects of a process to its source or to a preceding stage

the return to the input of a part of the output of a machine, system, or process (as for producing changes in an electronic circuit that improve performance or in an automatic control device that provide self-corrective action)

inhibition of an enzyme controlling an early stage of a series of biochemical reactions by the end product when it reaches a critical concentration

feedback that tends to dampen a process by applying the output against the initial conditions

feedback that tends to magnify a process or increase its output