| Acronym | Definition |
|---|
| CETIS➣Centre for Educational Technology Interoperability Standards (European Commission) |
| CETIS➣Centro de Estudios Tecnologicos Industriales y de Servicio (Spanish: Center for Technology Studies and Service Industry; Mexico) |
| CETIS➣Comprehensive Environmental Toxicity Information System |
| CETIS➣Complex Effluent Toxicity Information System |