For the purposes of this Regulation, the relevant definitions in Directives 2004/49/EC, 2007/59/EC and 2012/34/EU and in the implementing acts adopted under those Directives shall apply. For the purposes of this Regulation, the relevant definitions in Directive (EU) 2016/798 and in any delegated and implementing acts adopted under that Directive shall apply from the date on which that Directive becomes applicable to the authorisations and certificates referred to in points (a) and (b) of Article 1(2).