A "joint session" refers to a meeting where members from two different groups or branches, such as Congress or Parliament, join together to discuss or work on a specific topic or issue. Full definition
Next, we set up individual sessions if needed, and then schedule two or more joint sessions of about two hours each. (georgiadaniels.com)
I will meet both individually and in joint sessions with your spouse aiding you in looking at ways to minimize any of the negative impacts on your relationship. (theravive.com)
We can also provide joint sessions with the other parent or family members to help you agree on parenting arrangements. (relationshipswa.org.au)