once every two days

USAGE SUMMARY

"once every two days" is correct and is commonly used in written English.
You can use it to describe a regular occurrence that happens over a period of time that is divided into intervals of two days each. For example, "I have seen my friend once every two days for the last month."

✓ Grammatically correct

Science

News & Media

Wiki

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

According to a bifactorial design, six treatments, differing in the supplement and feeding frequency, were tested: the dry diet supplemented with Artemia nauplii or decapsulated cysts was supplied once a day, once every two days and once every three days.

Aquaculture

(e) 5 × 103 B16 TRCs were subcutaneously injected to C57BL/6 mice, and then mice were intratumorally treated with IFN-γ (10 μg per day) for 10 days, and then further treated with IFN-γ or IFN-γ+anti-IFN-γ antibody (250 μg per day) once every two days (n=8 per group).

Nature

I'm an avid runner, and have used a host of different wearables and activity trackers to try to maintain some kind of record of my regular runs (between once a day and once every two days, depending on how lazy I get).

TechCrunch

The poorest have also an instable access to food as coping mechanisms include skipping the number of meals per day or having them once every two days.

Food and Agriculture Organization of the United Nations

The total score was determined by defining "eat almost every day" as 1 point and "eat once every two days", "eat once or twice a week", or "seldom eat" as 0 points.

BMC Geriatrics

In warm conditions, stem cells at the root tip divide approximately once every two days, while for other meristematic cells this occurs approximately once per day (Campilho et al., 2006).

eLife

Regarding the feeding frequency, growth was higher when the food was supplied once a day, showing significant differences from the other two frequencies (once every two days and once every three days).

Aquaculture

I receive emails from officials about once every two days.

The Guardian

Community riots against poor service delivery occur once every two days.

The New Yorker

He said in evidence that he looked at pornography at least once every two days and sometimes every day.

Independent

Administration of 1000 nmol/kg 4d once every two days for a month normalized adiposity and glucose tolerance in diet-induced obese (DIO) mice.

European Journal of Medicinal Chemistry

Expert writing Tips

Best practice

When describing a routine or schedule, use "once every two days" to clearly communicate the frequency of an event or action. This phrasing is easily understood and avoids ambiguity.

Common error

Do not replace "once every two days" with more complex or obscure alternatives unless the context specifically demands it. Simpler phrasing ensures clarity and prevents misinterpretation.

Linguistic Context

The phrase "once every two days" functions as an adverbial phrase of frequency, modifying a verb to indicate how often an action occurs. Ludwig AI confirms its correctness and common usage in various contexts.

Expression frequency: Very common

Frequent in

Science

47%

News & Media

37%

Wiki

16%

Less common in

Encyclopedias

0%

Formal & Business

0%

Reference

0%

Ludwig's WRAP-UP

In summary, "once every two days" is a common and grammatically sound adverbial phrase used to indicate the frequency of an event or action. Ludwig AI confirms this. It is versatile, fitting seamlessly into scientific reports, news articles, and casual conversations alike. While simpler alternatives like "every other day" exist, "once every two days" remains a clear and widely understood option. The prevalence of its use in Science and News & Media further underscores its reliability and broad applicability.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

every other day

Uses a more concise phrasing to indicate the same frequency.

every two days

Simplifies the structure while maintaining the original meaning.

every second day

Another common and simple way to express the same frequency.

occurring every two days

Emphasizes the event or action that happens with the specified frequency.

on alternate days

Focuses on the alternating pattern of the occurrences.

at intervals of two days

Highlights the consistent spacing of the occurrences.

every 48 hours

Specifies the exact time interval between occurrences.

bi-diurnally

A more formal and less common adverb to express the same frequency.

with a two-day periodicity

A technical phrasing suitable for scientific or formal contexts.

one time in two days

A more literal and less idiomatic expression of the same frequency.

FAQs

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

Use "once every two days" to describe how often something happens. For example, "The medication should be taken "once every two days"." or "I water my plants "once every two days"."

What is a simpler way to say "once every two days"?

Alternatives include "every other day" or "every two days". These options are more concise while retaining the original meaning.

Is there a more formal way to say "once every two days"?

While "once every two days" is acceptable in most contexts, "bi-diurnally" is a formal and less common alternative to express the same frequency, best suited for technical or scientific writing.

How does "once every two days" compare to "twice every four days"?

Both phrases describe the same frequency, but "once every two days" is clearer and more direct. "Twice every four days" can be confusing and is less commonly used.