The Collaborative International Dictionary of English v.0.48:

Alcalde \Al*cal"de\, n. [Sp. alcalde, fr. Ar. al-q[=a]d[imac]
   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.
   [1913 Webster]

   Note: Sometimes confounded with Alcaid.
         [1913 Webster]

WordNet (r) 3.0 (2006):

alcalde
    n 1: a mayor or chief magistrate of a Spanish town

U.S. Gazetteer Places (2000):

Alcalde, NM -- U.S. Census Designated Place in New Mexico
   Population (2000):    377
   Housing Units (2000): 138
   Land area (2000):     0.512717 sq. miles (1.327932 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.512717 sq. miles (1.327932 sq. km)
   FIPS code:            02070
   Located within:       New Mexico (NM), FIPS 35
   Location:             36.087956 N, 106.057081 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Alcalde, NM
    Alcalde