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
- MCI, The IATA airport code for the Kansas City International Airport in Kansas City, Missouri, US
- Michigan City (Amtrak station), Indiana, United States; Amtrak station code MCI
- Motion clarity index, dimensionless value which describes the quality of LCD to show a moving picture
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