Depreciation is a term used for tax and accounting purposes that describes the method that a company uses to account for the declining value of its fixed assets (or tangible assets that have an estimated useful life of one year or longer).
Remember that the Verbal and Quantitative portions of the GRE have a score range between 130-170, and the average GRE score for is around 151 for Verbal and 152-153 for Quant.
No particular minimum score is defined. A competitive GRE score is typically considered to be one that is above 310 on combined Verbal and Quantitative portions and above 3.5 on the Analytical portion of the examination, with higher expectations for Ph.D. applicants and more flexibility for M.S. applicants.