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rate base

noun
  1. a guaranteed minimum amount or number used to compute advertising rates, as the number of subscribers to a publication.
  2. a basic amount or number used to compute charges to a customer, as the number of monthly phone calls.
  3. the valuation of property upon which tax rates are based.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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