every three weeks

USAGE SUMMARY

'every three weeks' is a correct and usable phrase in written English.
You can use it when referring to a regular frequency or period of time, such as: "I run a marathon every three weeks."

✓ Grammatically correct

Science

News & Media

Academia

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

New merchandise comes in every three weeks.

The New York Times - Travel

(They meet about every three weeks).

The New York Times - Magazine

Blood glucose and body weight were measured every three weeks.

Journal of Ethnopharmacology

Every three weeks I was at LaGuardia or Newark.

The New Yorker

Most clerks are audited once every three weeks, he said.

The New York Times

Every three weeks since, she has returned for more.

The New York Times

He took one day off every three weeks.

The New York Times

Our practice is open Monday through Saturday and our doctors rotate Saturdays every three weeks.

Cornell University

The cleanroom garments are washable, and the facility uses a laundry service approximately every three weeks.

Massachusetts Institute of Technology

We meet with them for 2 hours about every three weeks.

Princeton University

Beau went up about every three weeks.

Forbes

Expert writing Tips

Best practice

For clarity, when using "every three weeks", ensure the context clearly defines what event or action is recurring at this frequency. Specify if it's a one-time occurrence or an ongoing schedule.

Common error

Avoid vague statements about frequency when using "every three weeks". Instead of saying "the product is updated every three weeks", specify "new features are added to the software every three weeks" to eliminate confusion.

Linguistic Context

The phrase "every three weeks" functions primarily as an adverbial phrase of frequency, modifying verbs by specifying how often an action occurs. Ludwig examples show its use in various contexts, confirming its role in indicating regular intervals.

Expression frequency: Very common

Frequent in

Science

38%

News & Media

33%

Academia

15%

Less common in

Formal & Business

8%

Wiki

3%

Reference

3%

Ludwig's WRAP-UP

The phrase "every three weeks" is a common and grammatically sound adverbial phrase used to specify the frequency of an event or action. As Ludwig AI confirms, it is correct and usable in written English. Its versatility is evident in its presence across diverse contexts, including science, news, academia, and more. The examples analyzed highlight its function in describing recurring schedules, medical treatments, and planned intervals. When using "every three weeks", clarity and context are key to avoid ambiguity, ensuring the intended meaning is accurately conveyed. While alternatives like "triweekly" exist, the original phrase remains the most widely understood choice for expressing this particular frequency.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

every twenty-one days

Expresses the same duration using a specific number of days instead of weeks.

once every three weeks

Adds emphasis to the 'once' aspect of the recurring event.

at three-week intervals

Rephrases the original, focusing on the spacing between events.

at intervals of three weeks

Similar to 'at three-week intervals' but with slightly different wording.

in three-week cycles

Emphasizes the cyclical nature of the event.

on a three-weekly basis

Uses a more formal tone to indicate the frequency.

triweekly

This single word replaces the entire phrase with a less common but equivalent term.

occurring every three weeks

Uses a verb form to describe the frequency.

three weeks apart

Focuses on the separation in time between occurrences.

each three weeks

Highlights the individual recurrence of the three-week period.

FAQs

How can I use "every three weeks" in a sentence?

You can use "every three weeks" to indicate how often something happens. For example, "The team meets "every three weeks" to discuss project progress".

What's a shorter way to say "every three weeks"?

A shorter, though less common, alternative is "triweekly". However, ensure your audience understands this term, as it may also be confused with 'three times a week'.

Is it better to say "every three weeks" or "every 21 days"?

Both are correct. "Every three weeks" is generally more common and easily understood. "Every 21 days" may be more precise in contexts where exact timing is important.

What kind of events typically occur "every three weeks"?

Events that recur "every three weeks" can vary widely, including medical treatments, product updates, recurring meetings, or scheduled shipments. The context usually clarifies the specific event.