WordReference Random House Unabridged Dictionary of American English © 2020
American Expeditionary Forc′es, 
  • Militarytroops sent to Europe by the U.S. Army during World War I. Abbr.: A.E.F., AEF

  • 'American Expeditionary Forces' also found in these entries:
    Synonyms: Yanks, more...

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