The Collaborative International Dictionary of English v.0.48:

midfield \midfield\ n. (sport)
   the middle part of a playing field (as in football or
   lacrosse); as, he ran the kickoff back to midfield.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

midfield
    n 1: (sports) the middle part of a playing field (as in football
         or lacrosse)

U.S. Gazetteer Places (2000):

Midfield, AL -- U.S. city in Alabama
   Population (2000):    5626
   Housing Units (2000): 2393
   Land area (2000):     2.596068 sq. miles (6.723786 sq. km)
   Water area (2000):    0.002903 sq. miles (0.007519 sq. km)
   Total area (2000):    2.598971 sq. miles (6.731305 sq. km)
   FIPS code:            48376
   Located within:       Alabama (AL), FIPS 01
   Location:             33.455874 N, 86.927044 W
   ZIP Codes (1990):     35228
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Midfield, AL
    Midfield