What does alcalde mean?
The definition of alcalde
Al*cal”de, n.
Etym: [Sp. alcalde, fr. Ar. al-qadi judge, fr. qada to decide, judge. Hence, the cadi of the Turks. Cf. Cadi.]

A magistrate or judge in Spain and in Spanish America, etc. Prescott.

Note: Sometimes confounded with Alcaid.