1. A full assembly, as a joint legislative assembly
2. The state or a space in which a gas, usually air, is contained at a pressure greater than atmospheric pressure
3. 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
4. The whole of space regarded as being filled with matter (opposed to vacuum)
This word dates to the 1670's from Latin plenum ("full") as in plenum spatium ("full space"), which is the neuter of plenus ("complete, full") which ultimately derives from Proto-Indo-European *ple- ("to be full"). Plenum is the opposite of vacuum. But not this vacuum:
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| The opposite of this is a toddler (credit) |
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