IPA: //ˈkɒn.kleɪv//
KK: /kɒnˈkleɪv/
A private or secret meeting, often for a specific purpose, such as making important decisions or electing leaders.
The cardinals gathered in a conclave to elect the new pope.
Conclave is formed from "con-" (meaning together) and "clavis" (meaning key). The term originally referred to a gathering of cardinals locked together to elect a pope, emphasizing the idea of being together in a closed space, as if with a key.
Think of a group of people 'together' ('con-') in a locked room, where they need a 'key' ('clavis') to enter or exit — that's why a conclave is a private meeting.