was a non-SI unit
of land area
used in the Ottoman Empire
and representing the amount of land that can be plowed in a day; its value varied from 900-2500 m². In many formerly Ottoman regions, it is now defined as exactly one decare
It was defined as "forty standard pace
in length and breadth",V.L. Ménage, Review of Speros Vryonis, Jr. The decline of medieval Hellenism in Asia Minor and the process of islamization from the eleventh through the fifteenth century
, Berkeley, 1971; in Bulletin of the School of Oriental and African Studies
(University of London) 36
:3 (1973), pp. 659-661. but varied considerably from place to place.
The name dönüm
, from the Ottoman Turkish
دونمك / dönmek
(to turn) appears to be a calque
of the Byzantine stremma
and had the same size. It was likely adopted by the Ottomans from the Byzantines in Mysia
In Arabic, the word is spelled دونم
) which is "a square measure (Iraq = about 2500 m²; Israel = roughly, 1000 m²)."Cowan, J. Milton; Arabic-English Dictionary, The Hans Wehr Dictionary of Modern Written Arabic
(4th Edition, Spoken Languages Services, Inc.; 1994; p. 351)
it is called dekar (декар) and is equal to 1,000 square meters.
In Northern Cyprus
the donum is . In the Republic of......