at which day

USAGE SUMMARY

The phrase "at which day" is not correct and is not commonly used in written English.
It is typically used incorrectly when referring to a specific day in a more natural way, such as "on which day" or simply "which day." Example: "I need to know at which day the meeting is scheduled."

⚠ May contain grammatical issues

Human-verified similar examples from authoritative sources

Similar Expressions

59 human-written examples

Mosquitoes were maintained for an additional 3 days, at which point (day 12 post-infection) surviving mosquitoes were knocked down by cold treatment to collect infected salivary glands.

Biochemical Journal

Cells were incubated in 10% FBS/DMEM for 4 additional days, at which time (day 890%0% of the control cells were mature adipocytes that had accumulated fat droplets.

EMBO Molecular Medicine

In the Northern Hemisphere, neopagans celebrate Samhain as the last harvest, the point at which the day has shortened and winter is setting in.

Huffington Post

Micron Technology, which Monday closed at $13.05, was down 11 cents at $12.94.

Forbes

There were few premarket quotes for Texas Instruments, which Monday closed at $30.18.

Forbes

Here we use multistate capture recapture models with radiotelemetry data to determine the successional stage at which within-day movement probabilities of Amazonian birds in secondary forest are similar to those in primary forest.

Biological Conservation

It rebounded later in the morning to $1.2059, slightly higher than the $1.2033 at which it ended Thursday in New York.

Forbes

Day 0 means the day at which AKI was diagnosed based on AKI criteria.

EMBO Molecular Medicine

Containment fell from 60percentt on Thursday to 45percentt on Saturday -- the rate at which it remains on Monday.

Huffington Post

The deadline, previously Thursday, is now Monday, at which time CBS could be blacked out in three million subscribers' homes.

The New York Times

In the first patient group 'day 0' represents the day at which mechanical ventilation was initiated, in the latter group 'day 0' denotes the day at which the diagnosis of VAP was made clinically.

Critical Care

Expert writing Tips

Best practice

Instead of using "at which day", opt for the grammatically correct and more common phrase "on which day" or the simpler "which day" to refer to a specific day. For example, say "On which day will the event take place?" instead of "At which day will the event take place?"

Common error

A common mistake is using the preposition "at" instead of "on" when referring to specific days or dates. Always use "on" with days and dates to ensure grammatical correctness. For example, avoid saying "at Monday"; instead, say "on Monday".

Linguistic Context

The phrase "at which day" attempts to function as a prepositional phrase specifying a particular day. However, it's grammatically incorrect and deviates from standard English usage. Ludwig AI flags this as incorrect.

Expression frequency: Missing

Frequent in

Science

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News & Media

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Formal & Business

0%

Less common in

Science

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News & Media

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Formal & Business

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Ludwig's WRAP-UP

In summary, the phrase "at which day" is not grammatically correct in standard English. Ludwig AI identifies it as an incorrect phrase. More appropriate alternatives include "on which day" or simply "which day". Given its grammatical issues, "at which day" is unsuitable for formal or professional communication. It's essential to use "on" instead of "at" when specifying dates or days to ensure clarity and correctness in your writing.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

on which day

Uses the correct preposition "on" instead of "at" for specifying a day.

which day

A more concise and grammatically correct way to ask or specify a day.

what day

Similar to "which day" but using "what" to inquire about a specific day.

the day when

Rephrases using a relative pronoun to specify a particular day.

the date on which

More formal, emphasizing the specific date.

on what date

Specifically inquires about the date, using "on" and "what" for correctness.

during which day

Refers to an event happening during a specific day, though less common.

the day that

Uses "that" as a relative pronoun to specify the day, but less formal.

when

Simply uses "when" to refer to a point in time, including a specific day.

the particular day

Emphasizes specificity, focusing on a certain day being referenced.

FAQs

How to use "on which day" in a sentence instead of "at which day"?

Use "on which day" to specify a particular day something happens. For example, "The package will arrive "on which day" the delivery is scheduled."

What can I say instead of "at which day"?

You can use alternatives like ""on which day"", "which day", or "what day" depending on the context.

Which is correct, "at which day" or "on which day"?

"On which day" is the grammatically correct phrase. "At which day" is not standard English.

What's the difference between "which day" and "at which day"?

"Which day" is a direct and grammatically sound way to ask about or specify a day. "At which day" is not grammatically correct and should be avoided.