plenum
UK[ˈpliːnəm]US[ˈpliːnəm]
n
a full assembly of all members of a legislative body, committee, or other group.
n
a space completely filled with matter, or the whole of space regarded as being so filled (in physics).
n
a condition or space in which a gas, typically air, is at a pressure greater than atmospheric pressure.
Morpheme Breakdown
plen
um
plen
full
um
noun suffix
Etymology
the word plenum entered english in the 17th century, directly from latin, where plenum is the neuter form of plenus, meaning "full". this latin root can be traced back to the pie root pele-, meaning "to fill". the core semantic link from "fullness" to the modern meanings is elegantly logical. the primary sense of a "full assembly" is a direct metaphorical extension. the scientific senses, describing a space completely filled with matter or a state of positive air pressure, are precise technical applications of the same fundamental concept of fullness, moving from the abstract to the physical realm.
Analysis
Structure: plen (full) + um (noun suffix)
plen originates from latin plenus, meaning "full". the suffix -um is a latin neuter singular noun ending, often used to form nouns denoting a state, condition, or result.
Examples
the central committee will hold a plenum next month to decide on the new policy.
in classical physics, the idea of a plenum contrasted with the concept of a vacuum.
the server room is maintained at a plenum to prevent dust from entering through cracks.