Other
- Clinical Global Impression, a scale to assess treatment response associated with mental disorders
- Cognitively Guided Instruction, an approach to mathematics teaching and learning that focuses on students' thinking and solution strategies
- CpG islands, in genetics, genomic regions that contain a high frequency of CG dinucleotides
- Cape Girardeau Regional Airport, an airport (IATA airport code: CGI) in Cape Girardeau, Missouri, United States
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