[plee-nuh m, plen-uh m] /ˈpli nəm, ˈplɛn əm/

noun, plural plenums, plena
[plee-nuh, plen-uh] /ˈpli nə, ˈplɛn ə/ (Show IPA)
the state or a space in which a gas, usually air, is contained at a pressure greater than atmospheric pressure.
a full assembly, as a joint legislative assembly.
a space, usually above a ceiling or below a floor, that can serve as a receiving chamber for air that has been heated or cooled to be distributed to inhabited areas.
the whole of space regarded as being filled with matter (opposed to ).
noun (pl) -nums, -na (-nə)
an enclosure containing gas at a higher pressure than the surrounding environment
a fully attended meeting or assembly, esp of a legislative body
(esp in the philosophy of the Stoics) space regarded as filled with matter Compare vacuum (sense 1)
the condition or quality of being full

1670s, “filled space” (opposite of vacuum), from Latin plenum (spatium) “full (space),” neuter of adjective plenus “complete, full” (see plenary). The meaning “of a full assembly of legislators” is first recorded 1772.


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  • Plenary

    [plee-nuh-ree, plen-uh-] /ˈpli nə ri, ˈplɛn ə-/ adjective 1. full; complete; entire; absolute; unqualified: plenary powers. 2. attended by all qualified members; fully constituted: a plenary session of Congress. noun, plural plenaries. 3. a plenary session, meeting, or the like. /ˈpliːnərɪ; ˈplɛn-/ adjective 1. full, unqualified, or complete: plenary powers, plenary indulgence 2. (of assemblies, […]

  • Plenary-indulgence

    noun, Roman Catholic Church. 1. a remission of the total temporal punishment that is still due to sin after absolution. Compare (def 6).

  • Plenary session

    noun a meeting for all members attending a conference, either at the beginning to discuss general issues or at the end to announce progress Examples The keynote address was part of the plenary session. Word Origin 1878

  • Plench

    [plench] /plɛntʃ/ noun 1. a tool combining pliers and wrench: used especially by astronauts.

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