: missing in action
He was a U.S. Army veteran of Vietnam, where he was reported MIA for a period of time.The Pilot (Southern Pines, North Carolina)
often used figuratively for someone or something notably or unexpectedly missing, absent, or inactive
Anna Kournikova has been MIA since last month as the result of a stress fracture in her left foot.Sports Illustrated
… considered everything that could go wrong on her wedding day—lousy weather, droopy centerpieces, an MIA photographer …Jason Lynch
John Hurt … had critics and audiences marking him as a major new filmmaker. Then he went MIA [=he disappeared; he was not heard from] for five years …Stephen Rebello

Word History

First Known Use

1946, in the meaning defined above

Time Traveler
The first known use of MIA was in 1946

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Cite this Entry

“MIA.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/MIA. Accessed 9 Jun. 2026.

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