Definition of presidio in English:
 presidio
nounPlural presidios prɛˈsɪdɪəʊ-sēdē-
(in Spain and Spanish America) a fortified military settlement.
 Example sentencesExamples
-  An archeologist and architectural historian, his work has centered on missions, presidios, frontier forts, ranches, settlements, and industrial sites from Texas to California.
 -  In 1752, the Spaniards built a presidio, or garrison, in nearby Tubac and encouraged settlers to join the soldiers, making it the first European settlement in Arizona.
 -  Serra also assisted in founding four presidios (military garrisons).
 -  One way to celebrate the anniversary is at a November 10 lecture and walking tour of the presidio and Tubac townsite.
 
Origin
  
Spanish, from Latin praesidium 'garrison'.