MCI Inc

MCI may refer to:

• 1101, as Roman numerals
• mCi, millicurie, 1/1000 of a curie, a non-SI unit of radioactivity, 1 mCi = 3.7×10⁷ decays per second or becquerels.
• MCi, megacurie, 1,000,000 times a curie, a non-SI unit of radioactivity, 1 MCi = 3.7×10¹⁶ decays per second or becquerels.

Company

• MCI Inc., a former American telecommunications company acquired by Verizon Communications
• MCI Communications, originally Microwave Communications Inc., the corporation that operated as MCI from 1963–1998
• MCI Group Holding SA, event, communication and association management company
• Motor Coach Industries, a coach/bus manufacturing company
• MCI (audio), a company that manufactured multi-track audiotape recorders and mixing consoles for professional studio recording

Institute

• Maine Central Institute, a boarding school in Maine, founded in 1866
• Martingrove Collegiate Institute, a secondary school located in Toronto, Ontario.
• Medical Council of India
• Mennonite Collegiate Institute, a private, religious school in the town of Gretna, in Southern Manitoba.
• A Scientific Insitut Assosiated With The Southern University of Denmark in Sønderborg

University

• MCI Management Center Innsbruck, a university located in Innsbruck, Austria.

Health and Science

• Medical Council of India
• Mild cognitive impairment, a neurological affliction often associated with Alzheimer's disease
• Mass casualty incident, a medical emergency involving more patients than can be easily handled by the crews initally assigned to the incident.
• Magnetic Current Imaging using a Scanning SQUID microscope

Computer

• Media Control Interface/Multimedia Control Interface, an API for controlling multimedia peripherals connected to a Microsoft Windows or OS/2 computer
• Master Command Interface, The main terminal for a computer

Other

• Meal, Combat, Individual, the successor to the US Army C-ration.
• Monetary conditions index, a macroeconomic index number relevant for monetary policy.
• Malicious Caller Identification, a type of enhanced telephone service
• Macroinvertebrate Community Index, a measure used in New Zealand for the environmental status of streams.
• Miss Chinese International Pageant, an annual pageant where International women of Chinese descent compete for the crown of Miss Chinese International.
• The airport code for the Kansas City International Airport in Kansas City, Missouri, USA
• Michigan City (Amtrak station), Indiana, United States; Amtrak station code MCI.

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