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adapter

noun [C] (DEVICE) (also adaptor)
 
 
/əˈdæp.tər/ US  /-tɚ/

Definition

mainly UK a type of plug that makes it possible to connect two or more pieces of equipment to the same electrical supplyElectrical switches and connections a device that is used to connect two pieces of equipmentElectrical switches and connections
(Definition of adapter noun (DEVICE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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