Source : Webster's Revised Unabridged Dictionary (1913)

Reapportionment \Re`ap*por"tion*ment\, n.
   A second or a new apportionment.

Source : WordNet®

reapportionment
     n : a new apportionment (especially a reallotment of
         congressional seats in the United States on the basis of
         census results) [syn: {reallotment}, {reallocation}]