CONTRACTILITY
contractility
(noun) the capability or quality of shrinking or contracting, especially by muscle fibers and even some other forms of living matter
Source: WordNet® 3.1
Noun
contractility (countable and uncountable, plural contractilities)
The condition of being able to contract or shrink (used especially of muscles).
The extent to which something contracts or shrinks.
(physiology) The performance of cardiac muscle.
Source: Wiktionary
Con`trac*til"i*ty, n.
1. The quality or property by which bodies shrink or contract.
2. (Physiol.)
Definition: The power possessed by the fibers of living muscle of
contracting or shortening.
Note: When subject to the will, as in the muscles of locomotion, such
power is called voluntary contractility; when not controlled by the
will, as in the muscles of the heart, it is involuntary
contractility.
Source: Webster’s Unabridged Dictionary 1913 Edition