What does "conclave" mean?

Conclave: The body of cardinals shut up in the conclave for the election of a pope; hence, the body of cardinals. 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.

Additional senses

  1. 2.A private meeting; a close or secret assembly. The verdicts pronounced by this conclave (Johnson's Club) on new books, were speedily known over all London. Macaulay. To be in conclave, to be engaged in a secret meeting; -- said of several, or a considerable number of, persons.

Sources