positive feedback

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pos·i·tive feed·back

that which occurs when the sign or sense of the returned signal results in increased amplification or leads to instability.
Farlex Partner Medical Dictionary © Farlex 2012

positive feedback

See Feedback.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

pos·i·tive feed·back

(pozi-tiv fēdbak)
That found when the sign or sense of the returned signal results in increased amplification or leads to instability.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

positive feedback

The characteristic of any system with an output proportional to its input in which a portion of the output is fed back to the input in such a phase as to increase the input. The effect of this is rapidly, and sometimes dangerously, to increase the output. Compare NEGATIVE FEEDBACK.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

positive feedback

see FEEDBACK MECHANISM.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005