at first day

USAGE SUMMARY

The phrase "at first day" is not correct in standard written English.
The correct expression is "on the first day." Example: "On the first day of school, I was nervous but excited to meet my new classmates."

⚠ May contain grammatical issues

Science

News & Media

Human-verified examples from authoritative sources

Exact Expressions

13 human-written examples

The median age of the children at enrollment was 142 days; the median age at first day of illness information in the monitoring period was 174 days.

Emerging Infectious Diseases

At first day of the synchronization protocol the heifers received implants containing 3 mg of NORG and 2 mg of estradiol benzoate (EB).

Animal Reproduction Science

The median SOFA Score at first day of antibiotic therapy and ICU admission were 7 (4–11) and 7 (5–11) respectively.

Annals of Intensive Care

At first day of MV, median positive end-expiratory pressure (PEEP) was 12 cmH2O, plateau airway pressure 26 cmH2O and tidal volume 380 mL (Table 1).

Annals of Intensive Care

"It doesn't seem necessary at first (day one of the tenure track position) -- but as time goes on, you become worn down and then the pattern of who does what is already established and harder to change," she says.

Science Magazine

At θ of 0.8, the UV vis absorbance of complex solution at first day was obviously higher than that at seventh day, while at θ of 0.2, two absorbance curves at these two time points were almost superimposed, indicating that small complex particles were more stable than large ones because of electrostatic repulsion.

Polymer

Human-verified similar examples from authoritative sources

Similar Expressions

45 human-written examples

Collins said Josh Satin would likely start at first Sunday against Philadelphia's left-handed starter, John Lannan.

The New York Times

He is playing catcher tonight after a eventful game at first Saturday night.

The New York Times

Since 2008 he had appeared several times at First Friday, a monthly Gadsden street festival.

The Guardian - Music

At First Wednesday, there are never any assigned dishes -- in true California style, you cook your bliss.

The New York Times

Henin was sluggish at first Tuesday, shanking shots that she had hit superbly in her previous match against her fellow Belgian Yanina Wickmayer.

The New York Times - Sports

Expert writing Tips

Best practice

Use the standard English phrase "on the first day" to ensure clarity and grammatical correctness in your writing. For instance, say "On the first day of the experiment..." instead of "At first day of the experiment...".

Common error

Avoid using "at" to refer to specific days; "on" is the correct preposition. Saying "at first day" is grammatically incorrect; always use "on the first day".

Linguistic Context

The phrase "at first day" functions as an adverbial phrase attempting to specify a point in time. However, as indicated by Ludwig AI, the correct form is "on the first day". The use of "at" is grammatically incorrect in this context.

Expression frequency: Uncommon

Frequent in

Science

57%

News & Media

43%

Formal & Business

0%

Less common in

Academia

0%

Encyclopedias

0%

Wiki

0%

Ludwig's WRAP-UP

In summary, while the phrase "at first day" is used, it is grammatically incorrect. Ludwig AI suggests the correct alternative is "on the first day". This phrase attempts to mark a specific point in time, especially in scientific and news contexts. Therefore, it's recommended to use "on the first day" for clarity and grammatical correctness. Always prefer the standard English phrase to ensure accuracy in your writing.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

on the first day

Replaces the preposition "at" with "on" and adds the definite article "the", resulting in a grammatically correct and more common construction.

initially

Offers a concise adverbial alternative, focusing on the beginning or outset of an event or period.

at the start

A shorter alternative to "at the beginning", suitable for informal contexts.

at the beginning

Uses a more general phrase to indicate the start of something, suitable for contexts where the specific day isn't crucial.

at the outset

Similar to "at the beginning" but can imply a more formal or decisive start.

in the initial phase

Emphasizes a period or stage at the beginning, useful when discussing processes or developments.

early on

Indicates a time relatively close to the beginning, without specifying a particular day.

to begin with

Functions as a transitional phrase indicating the start of a discussion or series of events.

in the early stages

Focuses on the initial period of development or progress.

from the beginning

Emphasizes a continuous state or action starting from the initial point.

FAQs

What's the correct way to say "at first day"?

The correct phrase is "on the first day". Using "at" in this context is grammatically incorrect.

Is "at first day" grammatically correct?

No, "at first day" is not grammatically correct. The correct preposition to use with a specific day is "on", so you should say "on the first day".

What can I use instead of the phrase "at first day"?

Use "on the first day" to refer to a specific day. If you mean initially or at the beginning, you can use alternatives like "initially" or "at the beginning".

How do I use "on the first day" in a sentence?

You can use "on the first day" to indicate when something happened. For example, "On the first day of the conference, we attended the keynote speech."