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meaning of Sumerian . meaning of Greek and roman culture of or having both Greek and Roman characteristics:. meaning of Neolithic Revolution . meaning of polytheistic relating to or characterized by belief in or worship of more than one god. meaning of monotheistic relating to or characterized by the belief that there is only one God.. meaning of cuneiform . meaning of irrigation the supply of water to land or crops to help growth, typically by means of channels.. meaning of mathematics solving number and stuff. meaning of codify . meaning of democracy system of government