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n. pl. pre·si·di·os
A garrison, especially a fortress of the kind established in the southwest United States by the Spanish to protect their holdings and missions.
[Spanish, from Latin praesidium, guard, defense, from praesidēre, to guard; see preside.]
presidio(prɪˈsɪdɪˌəʊ; Spanish preˈsiðjo)
n, pl -sidios (-ˈsɪdɪˌəʊz; Spanish -ˈsiðjos)
(Military) a military post or establishment, esp in countries under Spanish control
[C19: from Spanish: garrison, from Latin praesidium a guard, protection; see preside]
n., pl. -sid•i•os.
1. a garrisoned fort; military post.
2. a Spanish penal settlement.
[1755–65, Amer.; < Sp < Latin praesidium garrison, post, literally, defense]
A Spanish term meaning guard, used to mean a fortress such as one established by the Spanish in the southwestern United States.