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Learner's definition of MISSING  
: unable to be found : not in a usual or expected place
◊ This phrase is more common in British English than in U.S. English.
— often + from — sometimes used in the phrase go missing
: needed or expected but not included — often + from

missing in action

— used to say that a soldier cannot be found after a battle and might have been killed, captured, or wounded
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