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series comma

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noun
  1. a comma used after the next-to-last item in a series of three or more items when the next-to-last and last items are separated by a conjunction. In the series A, B, C, or D, the comma after C is the series comma.
Also called serial comma.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018