Permission – this term is part of the Administrative Laws, where details an official order granting the applicant to perform a concrete legal activity with the approval, given by the Authorities. Usually the permit is granted in written form and sets up the frontiers (i.e. terms and conditions) for performing the concrete activity, so if these frontiers are not obeyed the permit could be validly revoked/terminated by the Authority which has issued it. Synonyms are “license”,”permit” and “warrant”.