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ENGLISH · A WORD WITH POSSIBILITIES

plenum.

A space that is completely filled with matter.

6 characters2 syllables approx.English language

Meaning & usage

noun/ˈpliːnəm/UK/ˈplɛnəm/US/ˈplinəm/US
  1. A space that is completely filled with matter.

  2. A state of fullness, a great quantity (of something).

    figuratively
  3. A legislative meeting (especially of the Communist Party) in which all members are present.

  4. An enclosed space having greater than atmospheric pressure.

  5. The space above a false ceiling used for cables, ducts etc.

  6. A type of network cabling which satisfies a given plenum rating for the purpose of fire safety.

Where this word comes from

From Latin plēnum n (“space filled with matter”), from plēnus (“full”). The sense of "legislative meeting" is a semantic loan from Russian пле́нум (plénum, “plenary session”), from the same Latin source.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.