Oscillator (noun)

1. A device that oscillates, or moves back and forth, between two or more positions.
2. A device that generates an alternating current or voltage.

Origin:

The word "oscillator" comes from the latin "oscillare" meaning "to swing".

Examples:

1. The radio station uses a powerful oscillator to broadcast its signal.
2. The oscillator in the watch keeps time by vibrating back and forth.
3. The oscillator circuit in the device creates a sine wave signal.
4. The quartz crystal oscillator is used in many electronic devices.
5. The oscillator is a key component in the operation of the instrument.