Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
once per year
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "once per year" is correct and usable in written English.
It can be used to indicate an event or action that occurs one time within a year. Example: "The company holds a major conference once per year to discuss future goals and strategies."
✓ Grammatically correct
Academia
Encyclopedias
News & Media
Science
Wiki
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
60 human-written examples
Earthquakes occur there about once per year.
Encyclopedias
Very great earthquakes occur on average about once per year.
Encyclopedias
We continue to prepare a Newsletter for publication roughly once per year.
Academia
The research committee meets with the candidate at least once per year to supervise the research.
Academia
Applications are accepted once per year and current recipients need to re-apply each year.
Academia
You may obtain a free credit report from each credit bureau once per year.
Mowing or cutting once per year after initial invasion is controlled will prevent further spread.
Academia
The Executive Director will invite nominations to the Board at least once per year.
Academia
This method of terrace cultivation allows fields to be sown more than once per year.
Encyclopedias
In our apartment building, the windows are cleaned professionally once per year.
News & Media
The car runs once per year.
Expert writing Tips
Best practice
When writing formally, consider using "annually" or "yearly" as concise alternatives to "once per year". However, "once per year" provides clarity and emphasis, especially in contexts where precision is needed.
Common error
Avoid using "once per year" when you mean a different frequency, such as "twice per year" (biannually) or "every other year" (biennially). Ensure you're accurately conveying the intended frequency.
Source & Trust
80%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "once per year" functions as an adverbial phrase, modifying a verb or clause to indicate the frequency of an action or event. Ludwig AI confirms its usability, and examples from Ludwig illustrate its role in specifying how often something occurs.
Frequent in
Academia
25%
Science
24%
News & Media
22%
Less common in
Wiki
15%
Encyclopedias
10%
Formal & Business
4%
Ludwig's WRAP-UP
In summary, the phrase "once per year" is a grammatically sound and highly common adverbial phrase used to indicate that something occurs annually. Ludwig AI confirms its correctness and usability. While alternatives like "annually" or "yearly" exist, "once per year" provides clarity and emphasis. It is appropriate for a wide range of contexts, including academic, scientific, news, and general writing. Its versatility and clarity make it a reliable choice for specifying annual frequency. Examples found in Ludwig span diverse fields, further highlighting its broad applicability.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
Annually
Single word replacement with same meaning. It offers a more concise way to express the same frequency.
Every year
Simple rephrasing using different wording with same meaning. Changes the structure slightly while keeping the meaning identical.
Yearly
Single word replacement with same meaning. Similar to 'annually', providing a more compact alternative.
Once a year
Reorders the words slightly to maintain the original meaning but with a different emphasis.
On an annual basis
More formal variation, suitable for business or academic contexts.
Per annum
Latin term with same meaning, generally used in financial contexts.
Each year
Similar to 'every year', but can imply a slightly stronger emphasis on each individual year.
At least once a year
Specifies a minimum frequency, implying it could happen more often.
One time each year
Emphasizes the single occurrence within the year, providing clarity.
Once in any given year
Adds a sense of generality, suitable for broad statements or regulations.
FAQs
What's a more formal way to say "once per year"?
Is it correct to say "one time per year" instead of "once per year"?
While "one time per year" is understandable, "once per year" is the more common and idiomatic way to express that something happens a single time within a year.
What's the difference between "once per year" and "at least once per year"?
"Once per year" means something happens exactly one time during the year. "At least once per year" implies it happens one or more times during the year.
How can I use "once per year" in a sentence?
You can use "once per year" to describe events or actions that occur annually, such as "The company holds a major conference once per year to discuss future goals and strategies."
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
80%
Authority and reliability
4.5/5
Expert rating
Real-world application tested