Positive feedback is a process in which the effects of a small disturbance on a system include an increase in the magnitude of the perturbation. That is, A produces more of B which in turn produces more of A. In contrast, a system in which the results of a change act to reduce or counteract it has negative feedback. Mathematically, positive feedba...
(from the article `electronics`) If feedback is positive, the feedback signal reinforces the original one, and an amplifier can be made to oscillate, or generate an AC signal. Such ...
feedback in which the returned signal tends to increase the output signal
An interaction that increases or amplifies the response of the system in which it is incorporated. 
Synonym for feedback ... <physiology> The return of some of the output of a system as input so as to exert some control in the process. ... (18 Nov 1997) ... 
See feedback.
Type: Term Definitions: 1. that which occurs when the sign or sense of the returned signal results in increased amplification or leads to instability.
Change in the state of a system that enhances the measured effect of the initial alteration.
[n] - feedback in phase with (augmenting) the input
mechanism that intensifies a change in the body’s physiological condition in response to a stimulus
An interaction that amplifies the response of the system in which it is incorporated. 
noun feedback in phase with (augmenting) the input
A process that is triggered by an initial change in an environmental variable which causes that variable to deviate further from the original condition. See negative feedback.