a connector for joining parts or devices having different sizes, designs, etc., enabling them to be fitted or to work together.
Also called plug adapter, adapter plug. a device that connects an electrical plug to an outlet that has a different plug shape:
Last time I traveled, I brought the wrong adapter.
Also called AC adapter, power adapter. a device with a cord that plugs into an electrical outlet and functions as an external power supply for a small or portable electronic device, usually converting AC current to DC:
I forgot to plug in the adapter, and my laptop died.
an accessory to convert a machine, tool, or part to a new or modified use.