Definition of Blackacre

Blackacre, Whiteacre, Greenacre, and variations thereof are the placeholder names of fictitious estates in land universally used by professors of law in common law jurisdictions, particularly in the area of real property, to discuss the rights of various parties to a piece of land. A typical law school or Bar exam question on real property might say:

John, owner of a fee simple in Blackacre conveyed the property "to Michael for life, remainder to Steven, provided that if any person should consume alcohol on the property before the first born son of Steven turns twenty-one, then the property shall go to Walter in fee simple." Assume that neither Michael, Steven, or Walter is an heir of John, and that John's only heir is his son, Edward. Discuss the ownership interests in Blackacre of John, Michael, Steven, Walter and Edward.

Where more than one estate is needed to demonstrate a point — perhaps relating to a dispute over boundaries or  riparian rights — a second estate will usually be called Whiteacre, a third, Greenacre, and a fourth, Brownacre.