'Reconfirm' definitions:

Definition of 'reconfirm'

From: WordNet
verb
Confirm again; "You must reconfirm your flight reservations"

Definition of 'Reconfirm'

From: GCIDE
  • Reconfirm \Re`con*firm"\ (r[=e]`k[o^]n*f[~e]rm"), v. t. [Pref. re- + confirm: cf. F. reconfirmer.] To confirm anew. --Clarendon. [1913 Webster]