plenum

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plenum

[′plen·əm]
(engineering)
A condition in which air pressure within an enclosed space is greater than that in the outside atmosphere.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Plenum

The air space in an integrated ceiling, which may be above the atmospheric pressure if used for the air supply, or below the atmospheric pressure if used for the air exhaust.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Plenum

 

a meeting of the entire membership of the elected ruling organ of an organization, such as a party, state, or labor organization.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

plenum

1. In suspended ceiling construction, the space between the suspended ceiling and the main structure above.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

plenum

In a building, the space between the real ceiling and the dropped ceiling, which is often used as an air duct for heating and air conditioning. It is also filled with electrical, telephone and network wires. See plenum cable.
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