Relating to a military group sent to a foreign land on a specific mission, or any journey organized to explore or accomplish a goal.
From Latin 'expeditus' meaning 'unimpeded or swift,' combined with '-ary' suffix. Used since the 18th century for military forces sent abroad.
Famous expeditionary forces include the U.S. Expeditionary Force in World War I and modern military operations—the word itself suggests speed and purpose, though these missions often take years!
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