'Excitability' definitions:

Definition of 'excitability'

From: WordNet
noun
Excessive sensitivity of an organ or body part [syn: excitability, irritability]
noun
Being easily excited [syn: excitability, excitableness, volatility]

Definition of 'Excitability'

From: GCIDE
  • Excitability \Ex*cit"a*bil"i*ty\, n. [Cf. F. excitabilit['e].]
  • 1. The quality of being readily excited; proneness to be affected by exciting causes. [1913 Webster]
  • 2. (Physiol.) 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. [1913 Webster]