名詞 plenum:

1. a meeting of a legislative body at which all members are present
2. an enclosed space in which the air pressure is higher than outside

ple.num

n.（名詞）
【復數(shù)】 ple.nums 或 ple.na [plô.n…, plμn.…]
An assembly or a meeting with all members present.
全體會議：所有成員出席的集會或會議
A condition, space, or enclosure in which air or other gas is at a pressure greater than that of the outside atmosphere.
充氣增壓：空氣或其它氣體壓力大于外界大氣壓力的狀態(tài)、空間或封閉空間
The condition of being full; fullness.
充滿：充足的狀態(tài)；充滿
A space completely filled with matter.
充滿物質(zhì)的空間

來源：
Latin plônum (spatium) [full (space)] [neuter of] plônus * see pel…-
拉丁語 plônum (spatium) [充滿的（空間）] [] plônus的中性 *參見 pel…-