Definitions:

1. A generator that produced an alternating current. noun
   • Emergency equipment may take the form of an automatically starting emergency alternator.
2. A small generator running under the hood of your car, driven by a belt on the engine, it turns mechanical motion into electrical energy. NOUN
   • The alternator in my car stopped working.

Synonyms:

• Dynamo
• Generator
• Producer
• Synchronous generator