A CONCLAVE is an 8-letter term for a confidential or secret meeting. A TRYST is a 5-letter term for a private, romantic rendezvous. Psst is a 4-letter term used to quietly get someone's attention, usually to share a secret. Lastly, a CRYPT is a 5-letter term for a hidden chamber or vault, often used to store secrets. All of these terms refer to a confidential or secret meeting, and can be used to describe a gathering of people who wish to keep their activities private.