retroactive(extending in scope, effect, application or influence to a prior time or to prior conditions) adjective [UK: ˌre.trəʊ.ˈæk.tɪv] [US: ˌretro.ʊ.ˈæk.tɪv]
retroaktivt adverb
retroactively(done after the fact) adverb [UK: ˌre.trəʊ.ˈæk.tɪ.vli] [US: ˌretro.ʊ.ˈæk.tɪ.vli]