# plenum

> English word · Noun · IPA /ˈpliːnəm/ · frequency rank #38,104

## Definitions
1. A space that is completely filled with matter.
2. A state of fullness, a great quantity (of something).
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.

## Etymology
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.

## Easily confused with
- **plum** (https://plainspell.com/en/vs/plenum-vs-plum)
- **plexus** (https://plainspell.com/en/vs/plenum-vs-plexus)
- **plenty** (https://plainspell.com/en/vs/plenty-vs-plenum)
- **phenom** (https://plainspell.com/en/vs/phenom-vs-plenum)

## Common misspellings (9)
`lpenum`, `pelnum`, `plenmu`, `plennum`, `plenumm`, `pleunm`, `pllenum`, `plneum`, `pplenum`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/plenum