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Nomenclature in English

Emergency department became commonly used when emergency medicine was recognized as a medical specialty, and hospitals and medical centres developed departments of emergency medicine to provide services. Other common variations include 'emergency ward', 'emergency centre' or 'emergency unit'.

Accident and emergency (A&E) is deprecated in the United Kingdom but still in common parlance. It is also still in use in Hong Kong. Earlier terms such as 'casualty' or 'casualty department' were previously used officially and continue to be used informally. The same applies to 'emergency room', 'emerg', or 'ER' in North America, originating when emergency facilities were provided in a single room of the hospital by the department of surgery.