Reestablished is a term that means to renew or revive something. It is the past tense of the verb 'REESTABLISH, ' which is defined as to bring back into existence or to restore to a former position or condition. The term can be used in many contexts, such as restoring a relationship, reviving a business, or reinstating a policy. Reestablishing something implies that it was once in existence and has been brought back to life.