Definition of conclave noun from the Oxford Advanced Learner's Dictionary

 

conclave

 noun
noun
BrE BrE//ˈkɒŋkleɪv//
 
; NAmE NAmE//ˈkɑːŋkleɪv//
 
(formal)
 
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a meeting to discuss something in private; the people at this meeting Word Origin late Middle English (denoting a private room): via French from Latin conclave ‘lockable room’, from con- ‘with’ + clavis ‘key’.
See the Oxford Advanced American Dictionary entry: conclave