Definition of covert adjective from the Oxford Advanced Learner's Dictionary

 

covert

 adjective
adjective
 
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BrE BrE//ˈkʌvət//
 
, BrE//ˈkəʊvɜːt//
 
; NAmE NAmE//ˈkoʊvɜːrt//
 
(formal) secret or hidden, making it difficult to notice covert operations/surveillance He stole a covert glance at her across the table. Every measure, both overt and covert, is being taken against terrorists. compare overt
Word Origin Middle English (in the general senses ‘covered’ and ‘a cover’): from Old French, ‘covered’, past participle of covrir, from Latin cooperire, from co- (expressing intensive force) + operire ‘to cover’.
See the Oxford Advanced American Dictionary entry: covert

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