Why is the ninth month called September?
1640s, "person or thing that generates," from Latin generator "a begetter, producer," agent noun from past participle stem of generare (see generation). Meaning "machine that generates power" first recorded 1794; in sense of "machine that generates electric energy," 1879. Fem. generatrix attested from 1650s.
generator gen·er·a·tor (jěn'ə-rā'tər)
One that generates, especially a machine that converts mechanical energy into electrical energy.