n 1  :  the return to the input of 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)  2 a  :  the partial reversion of the effects of a process to its source or to a preceding stage  b  :  the return to a point of origin of evaluative or corrective information about an action or process <student was solicited to help revise the nursing curriculum>  : also  :  the information so transmitted .
 
 
 
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