Etymology
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presidio (n.)

a seat of government, especially a place of military authority, hence, in U.S. Southwest, "a military post," 1808, American English, from Spanish presidio "fort, settlement," from Latin praesidium "defense, protection," from praesidere "to sit before, protect" (see preside). Related: Presidial; presidary.

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Definitions of presidio

presidio (n.)
a fortress established in the southwestern United States by the Spanish in order to protect their missions and other holdings;
Tucson was first settled as a walled presidio
From wordnet.princeton.edu