the amount of an artifact that has been produced by someone or some process; "they improve their product every year"; "they export most of their agricultural production"
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impurity
worthless material that should be removed; "there were impurities in the water"
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change
an event that occurs when something passes from one state or phase to another: "the change was intended to increase sales"; "this storm is certainly a change for the worse"
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disease
an impairment of health or a condition of abnormal functioning