all-or-none law

American  

[awl-er-nuhn] / ˈɔl ərˈnʌn /

noun

Physiology.

1. the principle that under given conditions the response of a nerve or muscle fiber to a stimulus at any strength above the threshold is the same: the muscle or nerve responds completely or not at all.

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Etymology

Origin of all-or-none law

First recorded in 1895–1900