all-or-none

American  

[awl-er-nuhn] / ˈɔl ərˈnʌn /

adjective

1. relating to a situation where agreement, participation, etc., must be taken in its entirety or not considered at all; all-or-nothing.

2. Physiology. relating to a process that happens either to the greatest possible extent or not at all.

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all-or-none Scientific  

/ 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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