pax the Latin word for peace; Pax in Roman mythology was the goddess of peace, equivalent of the Greek goddess Eirene. In the Christian Church, the pax is the kissing by all the participants at a mass of a tablet depicting the Crucifixion or other sacred object; the kiss of peace.

The Pax Romana the peace which existed between nationalities within the Roman Empire. It is generally regarded as operating from the beginning of Augustus's reign (27 bc) to the death of Marcus Aurelius (ad 180), and in extended usage may apply to a widespread state of peace maintained under any jurisdiction. From the 19th century, various terms modelled on this are recorded, as Pax Americana and Pax Britannica.

In the Christian Church, pax vobis means ‘peace be with you’, reflecting Christ's greeting to the Apostles after his resurrection as recounted in John 20.

PAX Telephony private automatic exchange