quan·tal 'kwänt-əl adj
1) of or relating to a quantum or to quanta (as of energy or a neurotransmitter) <\quantal release of acetylcholine>
2) being or relating to a sensitivity response marked by the presence or absence of a definite reaction <an all-or-none response to a stimulus is \quantal>

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quan·tal (kwahnґtəl) 1. of or relating to quanta. 2. denoting an all-or-none response, one for which partial responses are undetectable or are not measured, or a procedure (a quantal assay) in which such a response is measured.

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