A Dutch land area unit. The word does refer to property, but as a unit is very questionable.
In 17th century New York, after the Dutch withdrawal, the unit was spelled erve in English documents.¹
1. Richard M. Lederer, Jr.
Colonial American English. A Glossary.
Essex, Connecticut: A Verbatim Book, 1985.
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Last revised: 14 December 2005.