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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
The Age of Reptiles ended because it ... The Age of Reptiles ended because it had gone on long enough and it was all a mistake in the first place. A better day was dawning at the close of the Mesozoic Era. There were some little warm-blooded animals around which had been stealing and eating the eggs of the Dinosaurs, and they were gradually learning to steal other things, too. Civilization was just around the corner. Will Cuppy