| Acronym | Definition |
|---|
| TSEC➣Top Secret |
| TSEC➣Taiwan Stock Exchange Corporation |
| TSEC➣Transmission Security |
| TSEC➣The Solar Energy Consortium |
| TSEC➣Thadomal Shahani Engineering College (Mumbai, India) |
| TSEC➣Telecommunications Security |
| TSEC➣Tissue-Selective Estrogen Complex |
| TSEC➣Training Systems and Education Conference |
| TSEC➣The Solid Energy Crew (Swedish internet music group since 1996) |
| TSEC➣Technical Specification Evaluation Certificate |
| TSEC➣Thermally Stimulated Electric Conductivity |
| TSEC➣Transmission Secure |
| TSEC➣Three Speed Ethernet Controller |
| TSEC➣Tactical Speech Security Equipment |
| TSEC➣Terminal Secondary Radar Beacon |
| TSEC➣Telecommunications Systems Engineer Course |
| TSEC➣Transmission Security Encryption Code |
| TSEC➣Triangle South Enterprise Center (Dunn, NC) |
| TSEC➣Technical Specification Evaluation Centre (Bangalore, India) |
| TSEC➣Tertiary Student Enrolment and Completions |