adapter

noun

adapt·​er ə-ˈdap-tər 

a-

variants or less commonly adaptor

1

: one that adapts

2

a

: a device for connecting two parts (as of different diameters) of an apparatus

b

: an attachment for adapting apparatus for uses not originally intended

Synonyms of adapter

• accessory
• option
• appliance

Examples of adapter in a Sentence

adapters for the food mixer include a meat grinder and an ice cream maker

Recent Examples on the Web

Priced at $549, the 2026 Polymega will include the console itself, one of Polymega’s second generation universal wireless controllers, a power adapter, an HDMI cable, a dust cover, plus a 1-year limited warranty. — Mitch Wallace, Forbes.com, 18 Aug. 2026

The small, round sockets were recessed into the wall, and the adapter would hit the outlet plate, preventing the pins from going all the way into the holes. — Mark Marino, Travel + Leisure, 18 Aug. 2026

Most automatic portable washers rely on a quick-connect adapter that attaches to a standard sink faucet. — Ryan Brennan, Kansas City Star, 16 Aug. 2026

Automatic models connect to a sink faucet via a quick-connect adapter and handle the wash cycle on their own. — Ryan Brennan, Charlotte Observer, 14 Aug. 2026

Word History

Etymology

adapt + -er entry 2

First Known Use

1753, in the meaning defined at sense 2

Rhymes for adapter

• adaptor
• subchapter
• apter
• captor
• chapter
• raptor

Kids Definition

adapter

noun

adapt·​er

variants also adaptor

ə-ˈdap-tər 

1

: someone or something that adapts

2

a

: a device for connecting two parts (as of different diameters) of a usually larger device

b

: an attachment for adapting a device for uses not originally intended

Medical Definition

adapter

noun

adapt·​er

variants also adaptor

ə-ˈdap-tər 

1

: one that adapts

2

a

: a device for connecting two parts (as of different diameters) of an apparatus

b

: an attachment for adapting apparatus for uses not originally intended