The Oxford comma is the comma after the penultimate item in a list. It’s normally a matter of style — you can happily choose to leave it out — though in some cases it can clarify what would otherwise be an ambiguous meaning, as in this well-cited book dedication “To my parents, Ayn Rand and God.” Or, more pertinently, in a recent legal case where ambiguity hinging on the lack of an Oxford comma is costing a dairy firm a $5m overtime payment to its drivers.
HT: Jon Hoare
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