In recent decades natural, technological and other disasters have been increasing in frequency and magnitude, and the involvement of international organizations and professionals from different disciplines has been growing in parallel. By definition major emergencies call for outside aid and often international assistance. The many agencies and individual helpers from different countries, different languages and different specialties converge on the stricken site with the sole object of helping the victims, who are themselves of a different background and language. Communication among these people and a certain understanding of the varying terminology of the many professions and activities therefore become paramount if the difficulties of the disaster situation are not to be compounded with difficulties of communication. A common ground for understanding between doctors, engineers, meteorologists, nurses, nutritionists, planners, government officials, transport personnel and the many other workers involved in disaster preparedness, relief and rehabilitation is therefore indispensable. It is to this end that this multilingual, multidisciplinary Dictionary serves as an invaluable tool for the disaster manager, whatever his background and wherever he may be called upon to work. A precursor in Disaster Medicine, Dr. William Gunn has conducted numerous emergency missions for the United Nations and other agencies, and this Dictionary has been tested in the field and in training courses over many years.