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I have never heard of a list of GMAT Vocabulary. Unlike the GRE, the GMAT does not test understanding of the meaning of specific words. I guess the only place that this would come into play is you understanding of math terms and usages of words in SC. My advice, is to study based on one of the professional companies prep materials (Kaplan, Veritas, Manhattan, etc..) b/c they will teach you the specific vocab that will come in handy on test day. I would also learn more about the format of the GMAT so you can know what you really need to study.