Source : Webster's Revised Unabridged Dictionary (1913)

Alcalde \Al*cal"de\, n. [Sp. alcalde, fr. Ar. al-q[=a]d[=i]
   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}.