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1.
A secret meeting, especially one in which the cardinals of the Catholic Church meet to elect a pope. The name is derived from the Latin cum (with) and clavis (key), and implies the fact that the cardinals are locked together in a room until a new pontiff has been chosen.
Yo, the College of Cardinals met for a second day to prepare for the conclave to elect the pope’s successor.

That's hot.
by pope john paul II April 06, 2005
 
2.
An all male orgy with an entrance fee.
Daniel attended a conclave this weekend.
by g-meister208 March 08, 2014
 
3.
a cardinal circle jerk
The cardinals entered the conclave to masturbate to pictures of 8 year old boys.
by Assweepay April 16, 2005