Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym M21 is...

M21 is

  • Muhlenberg County Airport, Greenville, Kentucky USA

M21 is also in:

Acronym Definition Searched: MQ 48858 CALEA UVP 28207 JSL SM JC HNV PB IPR 59626 NCIS NCG ZGS