Definition of plenum in English:


Syllabification: ple·num
Pronunciation: /ˈplenəm, ˈplēnəm


  • 1An assembly of all the members of a group or committee.
    [influenced by Russian plenum 'plenary session']
    More example sentences
    • He said the next plenum of the central committee, scheduled after local party congresses from August this year to before March next year, will touch upon personnel matters for a new party leadership.
    • Then they hand out little circular mirrors to each member of the plenum.
    • A further plenum of the Central Committee met in Wuhan on 28 November.
  • 2 Physics A space completely filled with matter, or the whole of space so regarded.
    More example sentences
    • Imagine fracturing a material body such as a piece of wood, regarded as a plenum (full of matter).
    • A quantum vacuum is more like a plenum than like empty space.
    • The early universe was filled with radiation and a plenum of matter, originally hydrogen and helium, formed from elementary particles in the dense primeval fireball.
  • 2.1An enclosed chamber where a treated substance collects for distribution, as heated or conditioned air through a ventilation system.
    More example sentences
    • This strategy allows the floor level to be raised, and can be the plenum for distribution of conditioned air.
    • It acts like a big duct, serving as the return air plenum and natural ventilation shaft on fair weather days, and a thermal buffer during the morning heat gain.
    • Carbon dioxide levels in the plastic enclosure were manipulated by passing an air stream through a swamp cooler and into a plenum chamber underneath the enclosure that distributed it evenly over the floor of the enclosure.


late 17th century: from Latin, literally 'full space', neuter of plenus 'full'.

More definitions of plenum

Definition of plenum in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day maelstrom
Pronunciation: ˈmālˌsträm
a powerful whirlpool in the sea