noun
plenum
PLEE-num/ˈpliːnəm/
A meeting of all members of an organization.
The council holds a plenum to vote on its new rules.

Etymology
Latin plenus means full. Plenum first described filled space, then fullness generally; applied to an assembly, that fullness became the presence of the entire membership.
In context
third plenum of the 18th party Congress said that the private sector or Market forces will be a decisive allocator of resources
More examples
- Every member is expected to attend Friday's plenum.
- The committee approved the budget at its last plenum.
- The organization holds two plenums each year.
Forms
plenum · plenums · plena
plenary adjective — Including all members of an organization.