[ ôl′ər-nŭn ]

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.

Nearby words

  1. all-in wrestling,
  2. all-in-one,
  3. all-inclusive,
  4. all-night,
  5. all-nighter,
  6. all-or-none law,
  7. all-or-nothing,
  8. all-ordinaries index,
  9. all-out,
  10. all-over

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

  • 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