Great energy, drive, force, or power; vigour of body, mind or personality; oomph or pizzazz
Dynamic reality; active energy; continuous change, progress, or activity.
Any of several philosophical theories that attempt to explain the universe by an immanent force.
Lack of activity; sluggishness; said especially of the uterus, when, in labour, its contractions have nearly or wholly ceased.
In a person, unwillingness to take action.
The property of a body that resists any change to its uniform motion; equivalent to its mass.