term:

Nunc Pro Tunc

nunc pro tunc

: now for then used in reference to a judicial or procedural act that corrects an omission in the record, has effect as of an earlier date, or takes place after a deadline has expired [a nunc pro tunc order] [permitted to file the petition nunc pro tunc]

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.