Shorthand for "Missing in action" - refers to files which were expected but not received, or to a regular visitor who hasn't been seen for a while.
Short for Missing In Action, a box designated as MIA is unaccounted for and presumed missing.
missing in action - used when something that should have been handed in has no been handed in
abbr. - Missing Assignment (a student who did not participate in Lottery Self-Selection and who was expected to participate in Lottery Self-Selection).
Missing in action. The casualty is a hostile casualty, other than the victim of a terrorist activity, who is not present at his or her duty location due to apparent involuntary reasons and whose location is unknown.
Missing In Action. Anytime someone launched a plane but never recorded an end to the sorty, occurs when players are in the air beyond the frame end, may be a negative number if a launch occurred before the log was started.
Missing in Action (e.g., a geocache or hitch hiker)