gen·er·a·tor 
(jĕnə-rā′tər)
(jĕnə-rā′tər)n.
1.
a. One that generates, especially a machine that converts mechanical energy into electrical energy.
b. An apparatus that generates vapor or gas.
2. A circuit that generates a specified waveform.
3. Mathematics See generatrix.
4. Computers A program that produces specific programs from the definition of an operation.