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.
Let’s Pause And Talk About CommasEverything you want to know about when to use a comma. Learn all the ways to use a comma and the rules for when to use a comma.
Also called serial comma.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019