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override

noun [C] (DEVICE)
 
 
/ˌəʊ.vəˈraɪd/ US  /ˌoʊ.vɚ-/

Definition

a device that changes the control of a machine or system in special situations, especially from automatic to manual: The heating system has a manual override.Mechanical engineeringElectrical switches and connections
(Definition of override noun (DEVICE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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