Crossword Genius

A Roman peace (3)

Ross

I believe the answer is:

pax

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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" .)

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