Nunc pro tunc Term Nunc pro tunc Meaning Now for then. An action or ruling that applies retroactively to correct an earlier record or proceeding. Context Legal maxim More from Legal Maxims Nolle prosequi Non Sequitur Novation Nullum crimen sine lege, nulla poena sine lege Obiter dictum Onus probandi Pacta Sunt Servanda Palimony More from Legal Maxims