a certain day

USAGE SUMMARY

"a certain day" is a grammatically correct phrase and can be used in written English.
It means a specific or particular day, without specifying which day exactly. For example: - I remember a certain day in September when the leaves started to change colors. - They decided to hold the event on a certain day in July, but the date hasn't been finalized yet. - She received a mysterious package on a certain day in April, but she never found out who sent it. - The company had promised to deliver the order by a certain day in October, but it arrived two days later.

✓ Grammatically correct

News & Media

Academia

Science

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

Regarding the time process, it may be helpful to slow down the pace: if it seems difficult to come to a consensus on a certain day, it may be possible after one or two more days of reflection.

European Journal of Pediatrics

You prepare to pitch a certain day.

The New York Times - Sports

Because if you timebox in a certain day, you can actually finish the list.

Harvard Business Review

And they're regular, arriving always on a certain day, at a certain time.

Harvard Business Review

We had someone who promised us concrete information, a meeting on a certain day.

The Guardian

Could you ask a friend to spend a certain day a week with you, regularly, one-on-one?

The Guardian - Lifestyle

Let's say, for instance, that we know there will be an important vote in the Senate on a certain day.

The New York Times

The manager "found out at 12 45 on a certain day, and she gathered us all immediately.

The New York Times

I couldn't think of one to equal the others so I said, "We meet on a certain day each week".

The Guardian

The complaint was positive and absolute in alleging that petitioner on a certain day and at a specific place 'did receive (and) conceal' heroin.

Cornell University

For instance, a bird begins its migration on a certain day because fluctuations in daylight have a specific impact on the bird's endocrine system.

Massachusetts Institute of Technology

Expert writing Tips

Best practice

When planning events or setting deadlines, use "a certain day" in initial communications to provide a flexible timeframe that can be refined later.

Common error

Avoid using "a certain day" repeatedly in a single piece of writing. Overuse can make your writing sound imprecise or evasive. Instead, try to provide more specific information when possible, or vary your language using alternatives.

Linguistic Context

The phrase "a certain day" functions as a determiner phrase modifying a noun. It specifies that the noun (day) is particular but not explicitly identified. Ludwig AI confirms its usage in various contexts.

Expression frequency: Very common

Frequent in

News & Media

58%

Academia

21%

Science

21%

Less common in

Formal & Business

0%

Encyclopedias

0%

Wiki

0%

Ludwig's WRAP-UP

The phrase "a certain day" is a common and grammatically correct way to refer to a specific but unspecified day. As Ludwig AI points out, it appears frequently in various contexts, especially in News & Media and Academia. When using this phrase, consider whether providing a specific date would improve clarity or whether the vagueness is intentional. To prevent overuse, explore alternative phrases like "a specific day" or "a particular day". However, Ludwig provides ample examples of its correct and effective use across numerous reliable sources.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

a specific day

Replaces "certain" with "specific", emphasizing the defined nature of the day.

a particular day

Substitutes "certain" with "particular", highlighting the distinctiveness of the day.

a given day

Replaces "certain" with "given", suggesting the day is predetermined or assumed.

one day in particular

Adds emphasis, specifying that one day stands out among others.

a defined day

Emphasizes the clarity or establishment of the day being referenced.

a set day

Emphasizes the scheduled or predetermined nature of the day.

a specific date

More precise, referring to a specific point in time instead of a generic "day".

some day

More vague; indicates an unspecified day in the future or past.

on one occasion

Shifts the focus from a day to an event or instance within a period.

at some point

Even more general, referring to an indefinite time, not necessarily a full day.

FAQs

How can I use "a certain day" in a sentence?

You can use "a certain day" to refer to a specific but unspecified day. For example, "The package will arrive on "a certain day" next week."

What's the difference between "a certain day" and "a particular day"?

While both phrases are similar, "a certain day" often implies that the speaker knows the specific day but chooses not to reveal it, while "a particular day" simply emphasizes the distinctiveness of the day without necessarily implying it is known.

Which is correct, "a certain day" or "a specific day"?

Both phrases are grammatically correct and can be used interchangeably. "A specific day" may emphasize clarity, while "a certain day" may suggest the information is being withheld.

What can I say instead of "a certain day" to be more precise?

To be more precise, you could specify the exact date, like "on July 28th", or use a more specific phrase like "a specific date".