adapter

American  

[uh-dap-ter] / əˈdæp tər /

Or adaptor

noun

1. a person or thing that adapts.

2. 1. a connector for joining parts or devices having different sizes, designs, etc., enabling them to be fitted or to work together.

   2. Also called adapter plug.  Also called plug adapter,.  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.

   3. Also called power adapter.  Also called AC 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.

3. an accessory to convert a machine, tool, or part to a new or modified use.

4. Computers.

   1. expansion card.

   2. an external device containing the necessary circuitry to connect to or work with another device or system.

      a network adapter;

      a wireless adapter;

      a video adapter.

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Other Word Forms

• nonadapter
  noun
• nonadaptor
  noun

Etymology

Origin of adapter

First recorded in 1795–1805; adapt + -er ¹

Explanation

When you have two pieces of equipment that can't be connected directly, you may need an adapter to plug one into another. You might need an adapter to connect your cellphone to a computer. Computers, televisions, and cameras are just some of the devices that often require adapters to be charged or used in different ways. One common kind of adapter makes it possible to put a two-pronged plug into an outlet with three holes. A different way to use the word adapter is for a person who changes — or adapts — one work of art to fit in a different medium, like an adapter who writes an opera based on a comic book.

Example Sentences

Adapter Rachel Bennette leaves room for you to remain unsure — you will certainly be playing “Towards Zero: The Home Game,” if you are any sort of mystery fan.

From Los Angeles Times • Apr. 16, 2025

Its 130W Power Adapter has three USB-C ports for charging a computer, phone and tablet all at once off a single outlet.

From Seattle Times • Dec. 28, 2023

Satechi Aluminum Multi-Port Adapter $80 Adapter includes ports for 4K HDM, Gigabit Ethernet, USB-C charging, SD / micro card readers, USB 3.0.

From The Verge • Jul. 17, 2021

If you are in need of a more heavy-duty way to plug in larger electronics while overseas, the Bestek Universal Travel Adapter comes highly recommended.

From Slate • Jul. 12, 2018

The Adapter is loaded just like a Plate Holder.

From Premo Cameras 1914 by Canadian Kodak Company

Related Words

• connection