- Mechanics.
- the initial agent, as wind or electricity, that puts a machine in motion.
- a machine, as a water wheel or steam engine, that receives and modifies energy as supplied by some natural source.
- means of towing a cannon, as an animal, truck, or tractor.
- that which is the first cause of all movement and does not itself move.
- a person or thing that initiates or gives power and cohesion to something, as an idea, endeavor, or organization.
- the original or primary force behind an idea, enterprise, etc
- the source of power, such as fuel, wind, electricity, etc, for a machine
- the means of extracting power from such a source, such as a steam engine, electric motor, etc
- (in the philosophy of Aristotle) that which is the cause of all movement
- God, esp when considered as a first cause
