An exclusive excerpt from Grammar Girl’s new book, 101 Troublesome Words You’ll Master in No Time
Mignon Fogarty,
Episode #328

This is the final week that I’m going to give you a peek at the entries in my new book, Grammar Girl's 101 Troublesome Words You'll Master in No Time. Today, we’ll talk about the words “decimate” and “all right.”

When I was doing radio interviews last week to promote the book, multiple people called in to complain that other people are using the word “decimate” wrong, so I thought it would be a good entry to include this week.


What’s the Trouble? Some people cling to the belief that decimate can only mean “reduction by 10%.”

Here’s some background: The Roman military wasn’t as interested in justice as it was in order. We get the word “decimate” from the Romans’ brutal practice of punishing mutinous units by having the men draw lots, and then requiring the troops who were to survive to kill the unlucky 10 percent who chose the wrong lot.

“Decimate” has its etymological root in the Latin word for “tenth,” and it shares that root with words like “decimal” and “decimeter.” Because of these historical and etymological roots, some people believe that the only proper way to use “decimate” is to talk about something reduced by precisely 10 percent.

Usage experts disagree. The Merriam-Webster Dictionary of English Usage (MWDEU), for example, notes that “decimate” has never been used this way in English. Although there is an entry for the “reduction by 10 percent” meaning in the Oxford English Dictionary (OED), it contains no example sentences, which is unusual. The MWDEU editors believe that the OED definition was included merely to bridge the gap between the Roman practice and the standard English meaning, which is “a massive or severe reduction.”

What Should You Do? Use “decimate” without fear to describe a huge culling or loss. Because of its roots, “decimate” is particularly well used when describing significant casualties in a population of military troops or another group of people, but it can be used to describe any extreme loss.

Beware of using it to describe death or a complete loss, however. Those uses are incorrect.

Who, in the midst of passion, is vigilant against illness? Who listens to the reports of recently decimated populations in Spain, India, Bora Bora, when new lips, tongues and poems fill the world?

— Lauren Groff in the book Delicate Edible Birds: And Other Stories

Click here to read the rest of the article, which covers "alright" versus "all right."

About the Author

Mignon Fogarty

Mignon Fogarty is the founder of the Quick and Dirty Tips network and creator of Grammar Girl, which has been named one of Writer's Digest's 101 best websites for writers multiple times. The Grammar Girl podcast has also won Best Education Podcast multiple times in the Podcast Awards, and Mignon is an inductee in the Podcasting Hall of Fame. Mignon is the author of the New York Times best-seller "Grammar Girl's Quick and Dirty Tips for Better Writing" and six other books on writing. She has appeared as a guest on the "Oprah Winfrey Show" and the "Today Show" and has been featured in the New York Times, Business Week, the Washington Post, USA Today, CNN.com, and more. She was previously the chair of media entrepreneurship in the Reynolds School of Journalism in Reno, NV. She hates the phrase "grammar nazi" and loves the word "kerfuffle." She has a B.A. in English from the University of Washington in Seattle and an M.S. in biology from Stanford University. Mignon believes that learning is fun, and the vast rules of grammar are wonderful fodder for lifelong study. 

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