Definition from Wiktionary, the free dictionary
From Hebrew דּוּנָם (dunam) or Arabic دُونُم (dūnum), from Turkish dönüm, from dönmek (“to turn”). A probable calque of Byzantine Greek unit στρέμμα (strémma, “stremma”, literally “that which is turned”).
dunam (plural dunams)
- (historical) An Ottoman Turkish unit of surface area nominally equal to 1,600 square (Turkish) paces but actually varied at a provincial and local level according to land quality to accommodate its colloquial sense of the amount of land able to be plowed in a day, roughly equivalent to the Byzantine stremma or English acre.
- A modern Turkish unit of surface area equal to a decare (1000 m²), equivalent to the modern Greek stremma.
- Various other units in other areas of the former Ottoman Empire, usually equated to the decare but sometimes varying (as in Iraq, where it is 2500 m²).
- ^ OED, 2nd edition (1989, online)