quantal

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quan·tal / ˈkwäntl/ • adj. technical composed of discrete units; varying in steps rather than continuously: a quantal release of neurotransmitter. ∎  Physics of or relating to a quantum or quanta, or to quantum theory. ∎  chiefly Physiol. relating to or denoting an all-or-none response or state.DERIVATIVES: quan·tal·ly / ˈkwäntl-ē/ adv.