Source : Webster's Revised Unabridged Dictionary (1913)

Reconquer \Re*con"quer\ (r?*k?n"k?r), v. t. [Pref. re- +
   conquer: cf. F. reconqu['e]rir.]
   To conquer again; to recover by conquest; as, to reconquer a
   revolted province.

Source : WordNet®

reconquer
     v : conquer anew; "The country reconquered the territory lost in
         the previous war"