The Collaborative International Dictionary of English v.0.48:

airfield \air"field`\ ([^a]r"f[=e]ld`), n.
   1. 1 a place where planes take off and land; an airport; --
      usually used of airports other than those with regularly
      sheduled commercial flights, such as those at military
      bases or small fields for private aircraft.

   Syn: landing field, flying field, field
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

airfield
    n 1: a place where planes take off and land [syn: airfield,
         landing field, flying field, field]