n, pl  -ties  1  :  the property of protoplasm and of living organisms that permits them to react to stimuli  2 a  :  quick excitability to annoyance, impatience, or anger  b  :  abnormal or excessive excitability of an organ or part of the body (as the stomach or bladder) .
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.