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plenum: plenum: 1. In the philosophy of the Stoics, the whole of space regarded as being filled with matter.
2. An assembly or meeting with all members present.
3. A condition, space, or enclosure in which air or other gas is at a pressure greater than that of the outside atmosphere.
4. The condition of being full; fullness.
5. A space completely filled with matter. American Heritage Dictionary
Our enemies are innovative and ... Our enemies are innovative and resourceful, and so are we. They never stop thinking about new ways to harm our country and our people, and neither do we. George W. Bush Aug. 5, 2004, at the signing ceremony for a defense spending bill.