adj 1 : of or relating to a quantum or to quanta (as of energy or a neurotransmitter) < release of acetylcholine at a neuromuscular junction> 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 > .
release of acetylcholine at a neuromuscular junction> 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 
