Biennially vs. Biannually: What's the Difference?

Do you need to know the difference between 'biennially' vs. 'biannually?' If so, you aren't alone.

Here is the short answer: 

These adverbs are often used in official business and communications. It is essential that you understand exactly what they mean and how to use them.

So, keep reading!

What is the Difference Between 'Biennially' vs. 'Biannually?'

'Biennially' and 'biannually' are both terms used to describe how often a verb occurs. However, they have different meanings.

When and How to Use 'Biennially' vs. 'Biannually'

If you are signing a contract with a payment schedule, there is a big difference between being paid every two years and every six months.

Furthermore, if your boss asks you to schedule a 'biannual' event, they would not appreciate you booking it every two years.

So, here are a few tips for when and how to use these terms:

For example, you might say:

We have a family reunion biennially. We used to do it every year, but it was harder for everyone to attend. 

As an example, you could say:

You have to complete the productivity report biennially. Since you only have to do it once every two years, it can be challenging to remember. So, add a reminder to your calendar. 

As an example, you might hear someone say:

There are some plants that complete their lifecycle biennially.  

So, someone might ask you:

Are you coming to the biannual softball game? We missed you at the last game.

For example, I might say:

You have to read this magazine. The articles are so interesting that you won't be able to get enough. It's just too bad that they only publish it biannually. I hate waiting six months for the next issue. 

Definition of 'Biennially': What Does 'Biennially' Mean?

According to the Merriam-Webster Dictionary, the meaning of the adverb 'biennially' means:

It can also mean:

'Biennially' Terms and Phrases

Definition of 'Biannually': What Does 'Biannually' Mean?

The same dictionary defines the adverb 'biannually' as:

'Biannually' Terms and Phrases

Pronunciation of 'Biennially' vs. 'Biannually'

Now that you understand the difference between 'biennially' vs. 'biannually,' let's look at their pronunciations. Knowing how to pronounce these terms is just as important as knowing their definitions.

So, here is a quick pronunciation guide you can reference. 

bī-e-nē-al-lē

bī-an-ya-wel-lē

As you can see, these terms look similar, but they have very different pronunciations. So, when you are writing, be sure to use the correct spelling, and when you are speaking, ensure that you use the appropriate pronunciation.

Sample Sentences Using 'Biennially' vs. 'Biannually'

Before you leave, read these sample sentences using 'biennially' vs. 'biannually.' They will help you remember the difference between 'biennially' vs. 'biannually' and how to use them.

Biennially

Biannually

Biennially/Biannually

Review of the Difference Between 'Biennially' vs. 'Biannually'

Finally, let's recap the difference between 'biennially' vs. 'biannually': 

Even after learning the difference between these terms, they can be challenging to remember. So, if you ever get mixed up, you can always return to this post for a quick review.

You can also use our site to verify the meanings of other terms in the confusing words section. There are hundreds of posts, and each contains a brief and detailed explanation of the difference between the terms it covers and definitions, usage tips, grammar rules, and sample sentences.

Whether you are an aspiring writer or learning English as a second language, they are an incredible resource for expanding your vocabulary and learning how to use terms correctly.

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