Source : Webster's Revised Unabridged Dictionary (1913)

   {School days}, the period in which youth are sent to school.
      

   {School district}, a division of a town or city for
      establishing and conducting schools. [U.S.]

   {Sunday school}, or {Sabbath school}, a school held on Sunday
      for study of the Bible and for religious instruction; the
      pupils, or the teachers and pupils, of such a school,
      collectively.

Source : WordNet®

school district
     n : a district whose public schools are administered together