Noun
plenary session (plural plenary sessions)
A session of a conference or other meeting at which all members are expected to be present.
The conference consists of five regular sessions spread across multiple rooms and two plenary sessions in the main auditorium.
Unite behind the science, that is our demand. (Thunberg told a plenary session of the European Economic and Social Committee. Greta Thunberg
Plenary session - Formal sitting - International Holocaust Remembrance Day On the left is Mafred Weber, in the centre Joszef Szajer. Source: Internet