serial comma

noun
variants: or less commonly series comma

Definition of serial comma

:a comma used to separate the second-to-last item in a list from a final item introduced by the conjunction and or or
  • If you've always used the serial comma—“red, white, and blue”—its absence can look slipshod and lazy. If you were taught the more streamlined AP style—“red, white and blue”—the extra comma may seem fussy and pretentious.
  • —Jan FreemanPittsburgh Post-Gazette3 Apr. 2011
called also Harvard comma, Oxford comma

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First Known Use of serial comma

1922


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