at day

USAGE SUMMARY

The phrase "at day" is not correct in written English.
You could use the phrase "by day" meaning during the daytime or every day. For example, "We go on walks by day and watch the stars at night."

⚠ May contain grammatical issues

Science

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

mortality at day 28.

Intensive Care Medicine Experimental

Fluid balances at day.

Intensive Care Medicine Experimental

Survival at day 90 was 53.8%.

Clinical Microbiology and Infection

The benefit remained at day 90.

Archives of Physical Medicine and Rehabilitation

At day 60, lung architecture was normal.

The American Journal of Pathology

The girl was discharged at day +60.

Molecular and Cellular Pediatrics

D Alizarin red staining at day 21.

Nano Convergence

{text{ of fronds at day 0}}}}.

Botanical Studies

Mortality at day 28 was 40%.

Annals of Intensive Care

(D) NS size distributions at day 6.

Protein & Cell

Mortality was assessed at day 28.

Annals of Intensive Care

Expert writing Tips

Best practice

When writing about events occurring during the day, consider more precise alternatives like "during the day" or "in the daytime" for clarity and grammatical correctness.

Common error

Avoid using "at day" as a direct parallel to phrases like "at night". "At" is typically used with specific times or points, while "during" or "in" are more appropriate for longer periods like "the day".

Linguistic Context

The phrase "at day" primarily functions as an adverbial phrase attempting to specify a time. However, this usage is considered incorrect in standard English. Ludwig AI indicates that it's better to use alternative phrases like "during the day" or "in the daytime".

Expression frequency: Very common

Frequent in

Science

100%

Less common in

News & Media

0%

Formal & Business

0%

Ludwig's WRAP-UP

In summary, while the phrase "at day" appears with some frequency, Ludwig AI identifies it as grammatically incorrect in standard English. It attempts to function as an adverbial phrase indicating a time of occurrence but is better replaced with options like "during the day", "in the daytime", or "on that day", depending on the context. The prevalence of "at day" seems highest in scientific literature, potentially due to specific phrasing conventions or technical jargon; however, for general writing, it's advisable to use grammatically sound alternatives for clarity and correctness.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

during the day

This phrase accurately describes actions or events happening within the daylight hours.

in the daytime

This alternative specifically emphasizes the time when the sun is up and it is light.

on that day

Refers to a specific, previously mentioned day, adding clarity to the time frame.

by day

Implies actions or occurrences that happen regularly during the day, suggesting a routine.

each day

Highlights daily occurrences, focusing on the repetition of an event.

throughout the day

Expresses that something happens continuously from morning to evening.

daily

A simple adjective form indicating something that happens every day.

per day

Useful for specifying a quantity or rate that applies to each day.

on a daily basis

A more formal expression indicating regular, daily actions or events.

during daylight hours

Specifically refers to the period when there is natural light from the sun.

FAQs

What's a more appropriate way to say "at day" in a sentence?

Instead of "at day", consider using phrases like "during the day", "in the daytime", or "on that day" depending on the intended meaning.

Is there a difference in meaning between "at day" and "by day"?

"At day" is generally incorrect. "By day" implies actions happening regularly during the day, whereas "during the day" simply refers to the time when it is daylight.

How can I use "during the day" instead of "at day" in my writing?

Replace "at day" with "during the day" to describe activities or events that take place anytime between sunrise and sunset. For example, "The flowers bloom during the day."

When is it appropriate to use "on that day" instead of "at day"?

Use "on that day" when referring to a specific day that has already been mentioned or is understood from the context. For example, "The meeting is scheduled for the 15th; on that day, we will discuss the new strategy."