Excitability :: Excitability (n.) The quality of being readily excited; proneness to be affected by exciting causes.
Excitability :: Excitability (n.) The property manifested by living organisms, and the elements and tissues of which they are constituted, of responding to the action of stimulants; irritability; as, nervous excitability..
Excitable :: Excitable (a.) Capable of being excited, or roused into action; susceptible of excitement; easily stirred up, or stimulated..
Excitant :: Excitant (a.) Tending to excite; exciting.
Excitant :: Excitant (n.) An agent or influence which arouses vital activity, or produces increased action, in a living organism or in any of its tissues or parts; a stimulant..