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.
The fervour or tireless devotion for a person, cause, or ideal and determination in its furtherance; diligent enthusiasm; powerful interest.
The collective noun for a group of zebras.