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 The meaning of the word 

The word was used by Uyghurs, thus is used in turkic languages too. Yasa means (even in current Turkish) law. ""Anayasa"" (main yasa) means the constitution. It was known by others as ""Yasak"" (which means forbidden) because it said what was forbidden for them to do. (that word is used in currrent turkish as well)  "