1. In science, any device that transmits or modifies power, forces, or motion to do work can be classified as a machine.

A wrench, a jack, and a crowbar, used for changing tires are all "simple machines".

2. Any device that transmits, modifies, or magnifies forces for a specific purpose.

Machines typically either alter the amount of force applied, or the direction along which it is applied. A simple machine is a machine with only one or two parts.

1. A device which uses a source of power in order to perform the task for which it was designed: Mary was told that her washing machine needs to be repaired.
2. An organization of individuals dedicated to or committed to working together to achieve a desired end, often with political overtones: The mayor has a political machine working for his reelection.
3. Etymology: such words as, machine, machinery, and machination come from Greek mechane, "device, instrument, means". The same Greek element is the source of mechanical and mechanics.

Devices which help to perform work: "Most machines either overcome forces or change the direction of the applied forces."

To shape something by using a specifically designed tool: The parts of this engine have been precisely machined to function with other elements of the motor.