Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Characterized by either a complete response or by a total lack of response or effect, as in neurological action above a threshold: "Nerve impulses follow the All or None Law—that is, a nerve impulse generated by a weak stimulus is just as strong as one generated by a strong stimulus” ( Fundamentals of Biology).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. occurring completely or not occurring at all

Etymologies

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