不ふ遡そ及きゅうふそきゅうMeanings1nounnon-retroactivitylawLegal term meaning that a law, rule, or decision does not apply to past events or actions.この法ほう律りつには不ふ遡そ及きゅうの原げん則そくが適てき用ようされる。The principle of non-retroactivity applies to this law.
