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all-or-none

[ôl′ər-nŭn]
  1. Characterized by either a complete response or by a total lack of response or effect, depending on the strength of the stimulus. Neurons have an all-or-none response to impulse transmission and cannot be partially stimulated.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Examples from the Web for all-or-none

Historical Examples

  • It was an all-or-none reaction; the legs spurned the ground in perfect unison and with every bit of the power in them.

    Rastignac the Devil

    Philip Jos Farmer