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Serial comma

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The serial comma is a specific punctuation mark used in lists. It is placed after the penultimate term, which is the second-to-last item. This placement occurs just before the conjunction, such as "and" or "or." This happens when a writer lists three or more items. It is also known by several other names. You might hear it called the series comma, the Oxford comma, or the Harvard comma. These names come from the house styles of Oxford University Press and Harvard University Press.

Mechanically, the serial comma functions as a separator. In a list of three countries, you could write "France, Italy, and Spain." Without the serial comma, the list becomes "France, Italy and Spain." The mark serves to create a clear boundary between items. This can help follow the natural rhythm of spoken language. It is especially helpful for text meant to be read aloud by voice actors. Some people use the term to describe a comma placed before "etc." at the end of a list. This is because "etc." is an abbreviation for the Latin phrase "et cetera."

There are different ways people view the use of this comma. Some writers use it to resolve ambiguity, which means preventing confusion. Others argue that it can actually create new confusion in certain sentences. For example, a sentence like "To my parents, Mother Teresa and the pope" might be unclear. A reader could think Mother Teresa and the pope are the writer's parents. Adding the serial comma—"To my parents, Mother Teresa, and the pope"—makes it clear there are three separate groups. However, adding a comma can sometimes imply that the second item is a description of the first. This can lead to unintended humor or confusion in complex sentences.

The history of the comma is quite long. The mark itself is widely attributed to Aldus Manutius. He was an Italian printer during the 15th century. He used a mark that we now recognize as a comma to separate words. The word "comma" comes from the Greek word "komma." The specific practice of the serial comma is often linked to Horace Hart. Hart was the printer and controller of Oxford University Press from 1893 to 1915. In 1905, he wrote a style guide called "Hart's Rules for Compositors and Readers." This guide required the use of the serial comma at the press.

While Hart is often credited, the term itself is newer. The name "serial comma" did not exist until 1978. That was when Peter Sutcliffe used it in a historical account of Oxford University Press. Sutcliffe actually credited F. Howard Collins for mentioning the concept. Collins wrote about it in his 1905 book, "Author & Printer." This book was a guide for editors, printers, and typists. The use of the comma has existed for centuries in many languages. However, it has not always been regulated in a uniform way.

Today, different professional groups follow different rules. There is no single universal standard for using the serial comma. In the United States, the comma is very common. Many academic and legal guides require it. These include the APA style and the Chicago Manual of Style. The U.S. Government Printing Office Style Manual also mandates its use. In contrast, journalism often omits the comma. The Associated Press Stylebook and The New York Times Style Book recommend against it. Journalists do this to save space in narrow columns.

Regional differences also play a large role in how the comma is used. In British English, the serial comma is usually excluded. The Economist Style Guide notes that British writers use it mostly to avoid confusion. In Canada and Australia, it is often avoided in non-academic writing. It is typically only used if the absence of the comma creates ambiguity. Regardless of the style chosen, consistency is vital. Using the same rules throughout a single document makes the writing look professional. Whether a writer embraces it or avoids it, the comma remains a major topic of debate.

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