To be in conclave

from The Collaborative International Dictionary of English v.0.48
Conclave \Con"clave\ (? or ?; 277), n. [F., fr. L. conclave a
   room that may locked up; con- + clavis key. See {Clavicle}.]
   1. The set of apartments within which the cardinals of the
      Roman Catholic Church are continuously secluded while
      engaged in choosing a pope.
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   2. The body of cardinals shut up in the conclave for the
      election of a pope; hence, the body of cardinals.
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            It was said a cardinal, by reason of his apparent
            likelihood to step into St. Peter's chair, that in
            two conclaves he went in pope and came out again
            cardinal.                             --South.
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   3. A private meeting; a close or secret assembly.
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            The verdicts pronounced by this conclave (Johnson's
            Club) on new books, were speedily known over all
            London.                               --Macaulay.
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   {To be in conclave}, to be engaged in a secret meeting; --
      said of several, or a considerable number of, persons.
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