Black's Law Dictionary (2nd edition)dictionaries

Que Estate

L. Fr. whose estate. A term used in pleading, particularly in claiming prescrlptlon, by whlch it is alleged that the plalntlff and those former owners whose estate he has have lmmemorlally exer–clsed the right claimed. Thls was called “prescribing in a que estate.’’

Source: Black’s Law Dictionary 2nd Ed (1910)