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Q: What’s the difference between bi-annual and biennial?—Anonymous Black Trade; fitflop Patent Patent Tassel Womens Classic Superoxford Shoes 7dwd0q1

A: I see these words treated as if they were interchangeable—most often by marketing departments—but they aren’t. And marketing departments should be extra cautious, as misusing these two words could cost them quite a bit of money.

“Bi-annual” means twice a year, or two times within a 365-day period. So if you hire a heating company to do a bi-annual cleaning of your furnace, they will send someone out once in the summer and once in the winter—of the same year.

“Biennial,” on the other hand, means once every two years. Therefore, if you contract the heating company on a biennial basis, they will come out to your house every other year to clean your furnace. For example, I have my gutters cleaned on a Vast Running Sea Shoe Ns High Nike Coral White Navy Women's Kaishi Ankle Grey biennial basis. The gentleman who does it came out in May 2009, which means I won’t see his smiling face again until May 2011.

Be sure to get these words straight. If you say “biannual” when you mean “biennial,” you’ll be doubling the number of times you’ll have to do something in a given year (and quadrupling over a 2-year period). A mistake like that could really come back to bite you.

Brian A. Klems is the online managing editor of Writer’s Digest magazine.

Have a question for me? Feel free to post it in the comments section below or e-mail me at WritersDig@fwpubs.com with “Q&Q” in the subject line. Come back each Tuesday as I try to give you more insight into the writing life.

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0 thoughts on “Bi-annual vs. Biennial

  1. Paul Knipple

    Ankle Vast Running Nike Kaishi High Women's Grey Sea Shoe Coral White Navy Ns I actually get to make a minor correction! You would have to do four times as much work. Four visits in two years instead of one visit in two years.

    Grey Sea Ns Coral Shoe White Nike Ankle Vast Women's Running Kaishi High Navy Thanks for all your answers. We’re always winners here regardless. If we know the answer already, we feel smart. If not, we are made smarter.

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