EXCITABILITY
excitability, excitableness, volatility
(noun) being easily excited
excitability, irritability
(noun) excessive sensitivity of an organ or body part
Source: WordNet® 3.1
Etymology
Noun
excitability (countable and uncountable, plural excitabilities)
(uncountable) The state of being excitable
(countable) A measure of how easy something is to excite
Source: Wiktionary
Ex*cit"a*bil"i*ty, n. Etym: [Cf. F. excitabilité.]
1. The quality of being readily excited; proneness to be affected by
exciting causes.
2. (Physiol.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition