Romney Leigh, who lives by diagrams, And crosses not
the spontaneities Of all his individual, personal
life With formal universals. --Mrs.
Browning.
2. (Biol.)
(a) The tendency to undergo change, characteristic of both
animal and vegetable organisms, and not restrained or
cheked by the environment.
(b) The tendency to activity of muscular tissue, including
the voluntary muscles, when in a state of healthful
vigor and refreshment.