| Acronym | Meaning |
 | MHC | Major Histocompatibility Complex |
| NCI | U.S. National Cancer Institute |
| HAL | Hardware Abstraction Layer |
| EMDR | Eye Movement Desensitisation And Reprocessing |
| MKSA | Metre-Kilogram-Second-Ampere (system Of Units) |
| BSA | Birmingham Small Arms (motorcycles Company) - Boy Scouts Of America - Brigade Support Area |
| ZM | Zettametre |
| SCM | Surface Contamination Module |
| NSTAC | National Security Telecommunications Advisory Committee |
| DREA | Defence Research Establishment Atlantic (obsolete 2002) |
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