Definition

1. Noun:
   • An enclosed space in which the air pressure is higher than outside: In physics and engineering, a "plenum" is a chamber or space filled with a gas (typically air) at a pressure greater than that of the surrounding environment.
   • A meeting of a legislative or other deliberative body at which all members are present: In a formal or political context, a "plenum" refers to an assembly attended by all qualified members of an organization.

Examples of Usage

• Noun (Enclosed Space):

  • The air conditioning system uses the space above the ceiling as a supply plenum.
  • For safety, cables running through a plenum must have special fire-resistant insulation.

• Noun (Full Assembly):

  • The central committee will hold a plenum next month to decide on the new policy.
  • A plenum of the academic senate is required to amend the university's charter.

Advanced Usage

• "In plenum": This Latin phrase, meaning "in full," is sometimes used to emphasize that a decision was made by the entire body.
  • The resolution was adopted in plenum.
• The term is often used in the names of official bodies, particularly in political systems, e.g., "the Party Plenum."

Variants and Related Words

• Plenary (adj): Refers to a meeting intended for all members to attend, or something that is full, absolute, or unqualified.
  • A plenary session of the conference.
• Plenum cable (n): A specific type of cable designed for safe use in building plenum spaces due to its low flame-spread and low smoke-producing characteristics.
• Plenum chamber (n): A specific chamber or space acting as a plenum, often in mechanical systems.

Synonyms

• Chamber: For the enclosed space meaning.
• Assembly, full session, general meeting: For the meeting meaning.

Related Phrases

• Plenum system: A system for ventilating a building by forcing air into rooms from a central plenum chamber.
  • The building's plenum system provides efficient air distribution.

Noun

1. an enclosed space in which the air pressure is higher than outside
2. a meeting of a legislative body at which all members are present
   • the plenum will vote on all tax increases