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

This universal power adapter was also purchased more than 1,000 times in November. —Katie Jackson, Travel + Leisure, 23 Dec. 2025

Turbo also offers a €20 adapter for use with induction cooktops. —New Atlas, 18 Dec. 2025

Look for adapters stamped UL 2252 or SAE J3400/1 or endorsed by your automaker and revel in the convenience of using both national fast charging networks. —Mark Phelan, Freep.com, 13 Dec. 2025

The scanner can accommodate this range of formats by including a slide holder and three film adapters. —PC Magazine, 2 Dec. 2025

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