once every two years

USAGE SUMMARY

The phrase "once every two years" is correct and usable in written English.
You can use this phrase to indicate something that occurs every two years, such as a voter or census survey. For example: "A nationally representative survey of the voting population is conducted once every two years."

✓ Grammatically correct

News & Media

Science

Encyclopedias

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

Once every two years would be too little".

The New York Times

reviews each member country's policies once every two years.

The New York Times

They visited only once every two years, staying up to two months each time.

The New York Times

"Why should I? My parents only visit like once every two years".

The New York Times - Arts

Cetacean breeding is seasonal, usually in the winter, and females normally calve once every two years.

Encyclopedia Britannica

Once every two years a circus would come and that was so exciting.

The Guardian

Americans vote, if we vote at all, roughly once every two years.

The New Yorker

The applications are handed out once every two years to the first 200 people on line.

The New York Times

Getting painful sunburn, just once every two years, can triple your risk of melanoma skin cancer.

The Guardian

Across North America a person is killed by a grizzly about once every two years.

The New York Times

Late last year, the agency began to inspect the largest firms once every two years.

The New York Times

Expert writing Tips

Best practice

When writing about recurring events, use "once every two years" to clearly specify the biennial frequency. This avoids ambiguity that could arise from less precise terms like 'occasionally'.

Common error

Don't replace the phrase with overly formal or complex wording like 'on a bi-annual basis' when "once every two years" is clear and widely understood. Clarity is key.

Linguistic Context

The phrase "once every two years" functions as an adverbial phrase of frequency, modifying a verb to indicate how often an action occurs. Ludwig AI shows this phrase is used to specify the interval at which events, inspections, or processes are repeated.

Expression frequency: Very common

Frequent in

News & Media

50%

Science

35%

Encyclopedias

5%

Less common in

Wiki

5%

Formal & Business

3%

Reference

2%

Ludwig's WRAP-UP

In summary, the phrase "once every two years" is a grammatically sound and commonly used adverbial phrase that clearly indicates an event's frequency. Ludwig AI confirms its correctness and broad applicability. While alternatives like "biennially" exist, "once every two years" offers unambiguous clarity, particularly in news, scientific, and general contexts. When using this phrase, ensure it clearly modifies the verb and specifies the event's recurrence, avoiding vagueness or misinterpretations. By following this guidance, you can effectively communicate the specific timeframe of biennial events.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

every other year

Simple and common, focuses on the alternating nature of the occurrence.

every second year

More explicit, emphasizes the year-by-year count.

biennially

Single-word adverb, implies occurrence every two years, more concise.

occurring every two years

More verbose, restates the frequency in a descriptive manner.

every 24 months

Specifies the time frame in months for higher precision.

at two-year intervals

Similar to 'two-year interval', focuses on the gap between events.

two-year interval

Noun phrase, describes the period between occurrences rather than the occurrence itself.

a two-year frequency

Uses 'frequency' as a noun to describe how often something happens.

semi-annually, every other year

Combines less common word with easier term for clarity

every couple of years

Less precise, implies approximately every two years.

FAQs

How can I use "once every two years" in a sentence?

You can use "once every two years" to describe events that happen every two years, for example: "The conference is held "every other year", or "biennially"."

What is a more formal way to say "once every two years"?

A more formal way to say "once every two years" is "biennially".

What are some alternatives to the phrase "once every two years"?

Alternatives include "every other year", "every second year", or "at two-year intervals".

Is it correct to say "bi-annually" instead of "once every two years"?

While "bi-annually" might seem like a synonym, it can be ambiguous. It commonly means twice a year, so "every other year" or "biennially" are clearer options for "once every two years".