A Roman peace (3)
I believe the answer is:
pax
This might be a double definition.
'a roman' is the first definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?
'peace' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for pax that I've seen before include "Peace to the old Romans" , "Latin for peace" .)