plenum

/ˈplinəm/
noun
  1. A space that is completely filled with matter; in physics, a space containing a substance at higher pressure than the surrounding area.
    • The engineers designed a plenum to distribute air evenly throughout the building.
    • In physics class, we learned about the plenum as a model for the universe.
    • The plenum chamber in the ventilation system maintains air pressure.
  2. A full assembly of all members of a group or organization, especially a legislative or political body.
    • The party held a plenum to vote on the new policy.
    • All delegates attended the plenum to discuss the budget.
    • The committee's plenum was scheduled for the first Monday of the month.
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