from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A member of the armed services who is reported missing following a combat mission and whose status as to injury, capture, or death is unknown.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- Missing In Action
- Mutual Improvement Association
m(issing) i(n) a(ction).(American Heritage® Dictionary of the English Language, Fourth Edition)