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The oka, okka, or oke (Ottoman Turkish اوقه) was an Ottoman measure of mass, equal to 400 dirhems (Ottoman drams). Its value varied, but it was standardized in the late empire as 1.2829 kilograms. 'Oka' is the most usual spelling today; 'oke' was the usual contemporary English spelling; 'okka' is the modern Turkish spelling, and is usually used in academic work about the Ottoman Empire.
In Greece, the oka (οκά, plural οκάδες) was standardized at 1.282 kg and remained in use until traditional units were abolished on March 31, 1953—the metric system had been adopted in 1876, but the older units remained in use. In Cyprus, the oka remained in use until the 1980s.
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