Definitions

1. adjective

completely assembled or attended

“The plenary session of the conference was well-attended by experts from various fields.”

2. noun

a meeting or session at which all members are present, especially one that is open to the public

“The plenary meeting of the city council is held every Monday to discuss important issues.”

3. noun

a complete and full meeting or session, especially one that includes all the members of a group or organization

“The plenary session of the parliament was a historic moment in the country’s political history.”