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1. Characterized by either a complete response or by a total lack of response or effect, as in neurological action above a threshold.
1. of or pertaining to a process by which a muscle or nerve fiber either responds to a stimulus completely or not at all.
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|Adj.||1.||all-or-none - occurring completely or not occurring at all|
complete - having every necessary or normal part or component or step; "a complete meal"; "a complete wardrobe"; "a complete set of the Britannica"; "a complete set of china"; "a complete defeat"; "a complete accounting"