# plenum

/ˈpɫɛnəm/ (US) · /plˈɛnəm/ (UK) · CEFR C2 · Noun

Source: https://englishreference.com/word/plenum
Updated: 2026-05-26

## Definition

a meeting where everyone in a group is present. It can also mean a space that is completely full of something, like air or gas.

For teachers: a meeting of an entire body or assembly; also, a chamber or space filled with a fluid or gas. Often used in technical contexts to describe a volume of air or a full assembly of delegates.

## Examples

- The committee will discuss the proposal in a plenum tomorrow.
- After the breakout sessions, all the delegates gathered in the main hall for a plenum to vote on the final report.
- The physicist explained that the experiment required a vacuum, as the presence of air in the plenum would interfere with the delicate measurements of the particle's trajectory.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.