Dunam

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A dunam (Ottoman Turkish, Arabic: دونم; Turkish: dönüm; Hebrew: דונם), also known as a donum or dunum and as the old, Turkish, or Ottoman stremma, was the Ottoman unit of area equivalent to the Greek stremma or English acre, representing the amount of land that could be ploughed by a team of oxen in a day. The legal definition was "forty standard paces in length and breadth",^[1] but its actual area varied considerably from place to place, from a little more than 900 square metres (9,700 sq ft) in Ottoman Palestine to around 2,500 square metres (27,000 sq ft) in Iraq.^[2][3]

The unit is still in use in many areas previously ruled by the Ottomans, although the new or metric dunam has been redefined as exactly one decare (1,000 square metres (11,000 sq ft)), which is 1/10 hectare (1/10 × 10,000 square metres (110,000 sq ft)), like the modern Greek royal stremma.^[3]

The name dönüm, from the Ottoman Turkish dönmek (دونمك, "to turn"), appears to be a calque of the Byzantine Greek stremma and had the same size. It was likely adopted by the Ottomans from the Byzantines in Mysia-Bithynia.^[4]

The Dictionary of Modern Greek defines the old Ottoman stremma as approximately 1,270 square metres (13,700 sq ft),^[5] but Costas Lapavitsas used the value of 1,600 square metres (17,000 sq ft) for the region of Naoussa in the early 20th century.^[6]

In Bosnia and Herzegovina and also Serbia, the unit is called dulum (дулум) or dunum (дунум). In Bosnia and Herzegovina dunum (or dulum) equals 1,000 square metres (10,764 sq ft). In the region of Leskovac, south Serbia, One dulum is equal to 1,600 square metres (17,222 sq ft). In Albania it is called dynym or dylym. It is equal to 1,000 square metres (10,764 sq ft).^[7]

In Bulgaria, the decare (декар) is used, which is an SI unit, literally meaning 10 ares.

In Cyprus, a donum is 1337.803776 m² or 14400 square feet.^[8] In the Republic of Cyprus older Greek-Cypriots also still refer to the donum using the local Greek Cypriot dialect word σκάλες [skales], rather than the mainland Greek word stremma (equivalent to a decare). However, since 1986 officially Cyprus uses the square metre and the hectare.

A donum consists of 4 evleks, each of which consists of 334.450944 m² or 3.600 square feet.

In Greece, the old dönüm is called a "Turkish stremma", while today, a stremma or "royal stremma" is exactly one decare, like the metric dönüm.^[3]

In Iraq, the dunam is 2,500 square metres (0.25 ha).^[9]

In Israel and Turkey, the dunam is 1,000 square metres (10,764 sq ft), which is 1 decare. From the Ottoman period and through the early years of the British Mandate for Palestine, the size of a dunam was 919.3 square metres (9,895 sq ft), but in 1928, the metric dunam of 1,000 square metres (0.10 ha) was adopted, and this is still used today in Israel.^[10][11]

The Dubai Statistics Center and Statistics Centre Abu Dhabi use the metric dunam (spelt as donum) for data relating to agricultural land use.^[12] One donum equals 1,000 square metres (10,764 sq ft).

Other countries using a dunam of some size include Libya and Syria.^{[citation needed]}

A metric dunam is equal to:^{[citation needed]}

• 1,000 square metres (exactly)^[12]
• 10 ares (exactly)
• 1 decare (exactly)
• 0.1 hectares (exactly)^[12]
• 0.001 square kilometres (exactly)
• 0.247105381 acres (approx)
• 1,195.99005 square yards (approx)
• 10,763.9104 square feet (approx)

The Byzantine Greek stremma was the probable source of the Turkish unit. The zeugarion (Turkish çift) was a similar unit derived from the area plowed by a team of oxen in a day. The English acre was originally similar to both units in principle, although it developed separately.^{[citation needed]}

• Orders of magnitude (area) for further comparisons
• Conversion of units
• Feddan, a similar non-SI unit of area used in Egypt, Sudan, and Syria
• Resm-i dönüm, a land tax based on the area of a farm

• Foreign Weights and Measures Formerly in Common Use
• Dictionary of units
• Variable donums in Turkey
• Summary based on UN handbook