| Acronym | Definition |
|---|
| MSec➣Multicast Security |
| MSec➣Millisecond |
| MSec➣Mandrake Security |
| MSec➣Medical Supplies & Equipment Company (various locations) |
| MSec➣Myanmar Securities Exchange Centre (est. 1996; joint venture; Myanmar and Japan) |
| MSec➣Message Security |
| MSec➣Mathematical and Scientific E-Content |
| MSec➣Mohamed Sathak Engineering College (India) |
| MSec➣Mongolian Securities and Exchange Commission |
| MSec➣Major and Special Events Committee (Worcester Polytechnic Institute) |
| MSec➣Mountain State Employers Council |
| MSec➣Mennonite Secondary Education Council |
| MSec➣Master of Science in Economics |
msec - one thousandth (10^-3) of a second