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In page Gematria:

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Classical scholars agree that the Hebrew word gematria was derived from the Greek word γεωμετρία geōmetriā, "geometry",[1] though some scholars believe it to derive from Greek γραμματεια grammateia "knowledge of writing".[citation needed] It is likely that both Greek words had an influence on the formation of the Hebrew word.[2][3] Some hold it to derive from the order of the Greek alphabet, gamma being the third letter of the Greek alphabet ("gamma tria").[1]