Abbreviations
- In education
- MEI Academy, international school
- MEI (Mathematics in Education and Industry), examination board affiliated with the OCR examination board.
- Mennonite Educational Institute - an independent grades K-12 school in Abbotsford, British Columbia
- In businesses
- MEI (company), manufacturer of cash handling systems
- Matsushita Electric Industrial Co., Ltd.
- In government
- Ministério da Economia e Inovação, the Portuguese economy ministry.
- Middle East Institute
- Marginal Efficiency of Investment is a relationship between interest rate and amount of investment that can be profitable at a given time.
- Meridian Regional Airport
- Montreal Economic Institute
- Methyl iodide as MeI, a halomethane
- Meridian (Amtrak station), Amtrak station code MEI, Mississippi, United States
- Music Encoding Initiative, a music encoding format
- Medicare Economic Index
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