Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
At one instance
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "At one instance" is not correct in standard written English.
The correct expression is "At one instance" should be "At one instance" or "At one point." Example: "At one instance during the meeting, I realized we were all on the same page."
⚠ May contain grammatical issues
News & Media
Science
Alternative expressions(4)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
1 human-written examples
At one instance, Disgust takes over when she has to eat broccoli, and at another time Anger causes her to have a temper tantrum and overwhelms her when she has a difficult time adjusting in school.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
56 human-written examples
In at least one instance on the campaign trail so far, Clinton's progressive messaging seemed at risk of speaking too narrowly to the core Democratic voter.
News & Media
Sign up now Theget thuntaht of VICE Canada delivered straight to your inbox...
News & Media
So far in this college football season, the Times computer has been made fun of, cussed at and, in at least one instance, agreed with.
News & Media
In at least one instance, this focus on the geostrategic reality risks ignoring another reality, that something can be of decisive importance simply because everybody thinks it is.
News & Media
In at least one instance, a parent identified her own children on ISawYourNanny and fired the caregiver.
News & Media
She's a one-man woman, but he strays, in at least one instance with a woman who works at the gallery and supports it.
News & Media
In keeping with the younger age at onset, 56% of BRCA1 families included at least one instance of bilateral disease, compared to 28% of BRCA2 families.
Science
Earlier this month, the school admitted in a letter summarizing the findings of an internal investigation that at least 12 former teachers molested, and in at least one instance, raped, students in a pattern dating back to the 1960s.
News & Media
In a sample of 24,017 adults with chronic disease who self-identified as being medication persisters, 70% reported at least one instance of unintentional non-adherence, and 34% reported at least one instance of intentional non-adherence in the past six months.
Science
In at least one instance, Mr. Lussen was a strong voice for more accountability on the part of detectives.
News & Media
Expert writing Tips
Best practice
Avoid using "At one instance" in formal writing. Opt for more common and grammatically correct alternatives such as "In one instance" or "On one occasion."
Common error
The phrase "At one instance" incorrectly uses the preposition "at" where "in" is more appropriate. Remember that "instance" typically refers to a specific case or occurrence within a broader context, making "in" the better choice.
Source & Trust
87%
Authority and reliability
2.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "At one instance" attempts to function as an adverbial phrase, modifying a verb or clause by specifying a particular occurrence or moment. However, Ludwig AI indicates that is not correct in standard written English.
Frequent in
Science
33%
News & Media
33%
Formal & Business
0%
Less common in
Academia
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
The phrase "At one instance" is generally considered grammatically incorrect and should be avoided in formal writing. Ludwig suggests it's better to use "in one instance" or similar alternatives like "on one occasion" or "in one case". While the intent is to specify a particular occurrence, the incorrect preposition undermines its effectiveness. Stick to established phrases to maintain clarity and credibility in your writing. Remember to prefer established and correct forms for better clarity, especially in contexts such as scientific or professional writings.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
In one instance
Omits the preposition "at", resulting in a more natural and grammatically correct phrase.
On one occasion
Replaces "instance" with "occasion", offering a slightly more formal alternative.
In one case
Substitutes "instance" with "case", providing a simpler and more direct option.
On one occasion
Changes “instance” to “occasion” and removes the preposition “at”.
At one point
Uses "point" instead of "instance", focusing on a specific moment in time.
At a certain moment
Emphasizes a particular moment, adding a slightly more descriptive element.
In a specific situation
Rephrases the idea to focus on a particular set of circumstances.
In a given event
Replaces instance with "event", highlighting a particular occurrence.
Once
Simplifies the phrase to a single word, indicating a single occurrence.
In a situation
Removes "one" to sound more generic and less specific.
FAQs
What's grammatically wrong with "At one instance"?
The preposition "at" is incorrectly used. The correct phrasing is "In one instance". "Instance" describes something happening within a context, so "in" is more appropriate.
What can I say instead of "At one instance"?
You can use alternatives like "in one instance", "on one occasion", or "in one case" depending on the context.
Which is correct, "At one instance" or "In one instance"?
"In one instance" is the correct and more widely accepted phrasing. "At one instance" is considered grammatically incorrect.
Is "At one instance" ever acceptable in writing?
While it might be understood in very informal speech, "At one instance" should be avoided in formal or professional writing. Opt for grammatically sound alternatives such as "in one instance".
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
87%
Authority and reliability
2.8/5
Expert rating
Real-world application tested