Definition of Mediastinum. Mediastinum: The area between the lungs. The organs in the mediastinum include the heart and its large veins and arteries, the trachea, the esophagus, the bronchi, and lymph nodes. Search MedTerms:
The Pax Romana ended because the Roman state had ceased to grow. Boundaries had been set for the Empire, and for the first time the army had become a drain on the econom â¦ y of Rome. Till this point the army provided new slaves and riches from conqured countries.
Definition: Pax Romana is Latin for Roman Peace.. The Pax Romana lasted from about 27 B.C. (with Augustus) until A.D. 180 - the death of Marcus Aurelius. Some date the Pax Romana from A.D. 30 to the reign of Nerva. Others date it as late in the reign of Augustus as the year A.D. 14.