- DSEi stands for Defence & Security Equipment International (trade show; UK)
- DSEI stands for Defence Systems & Equipment International (exhibition & conference)
- DSEI stands for Division of State Employees’ Insurance (Florida)
- DSEI stands for Direct Selling Educational Institute (Dubai, United Arab Emirates)
- DSEI stands for Dougherty Sprague Environmental, Inc. (Richardson, TX)
Abbreviations And Their Meaning