conclave
/ˈkɒnkleɪv/noun
1- a private meeting秘密会议。
1.1
- (in the Roman Catholic Church) the assembly of cardinals for the election of a pope（天主教）教皇选举枢机会议。
1.2
- the meeting place for such an assembly（天主教）教皇选举枢机会议室。
词源
late Middle English (denoting a private room)： via French from Latin conclave 'lockable room'， from con- 'with'+clavis 'key'.