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- (business) electronics manufacturing service: a type of OEM (original equipment manufacturer) service.
- (US, medicine) emergency medical service: an organization, often part of a local government whose purpose is to provide emergency medical care to the public.
- (business) express mail service: a type of international express mail services.
- (dated, computing) Expanded Memory Specification
- environmental management system
EMS m (plural EMSs)
- Initialism of .