The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
reconquer v 1: conquer anew; "The country reconquered the territory lost in the previous war"