The Collaborative International Dictionary
Vacatur
Vacatur \Va*ca"tur\, n. [NL., it is made void, fr. L. vacare to be empty. See Vacant.] (Law) An order of court by which a proceeding is set aside or annulled.
Wiktionary
vacatur
n. (context legal English) An announcement in court that something is cancel or set aside; an annulment.