plenum
Concise Oxford English Dictionary © 2008 Oxford University Press:
plenum /ˈpliːnəm/
▶noun
- 1 an assembly of all the members of a group or committee.
- 2 Physics a space completely filled with matter, or the whole of space so regarded.
– origin C17: from L., lit. ‘full space’, neut. of plenus ‘full’.
'plenum' also found in these Oxford entries:

