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
but one requirement
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "but one requirement" is correct and usable in written English.
It can be used to emphasize that there is only a single condition or stipulation that must be met in a given context. Example: "The project is nearly complete, but one requirement remains: we need to finalize the budget."
✓ Grammatically correct
News & Media
Science
Wiki
Alternative expressions(3)
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
Yet, social scientists have long identified distinguishing characteristics of a diaspora, and human movement or migration is but one requirement.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
55 human-written examples
Running requires very little equipment, but the one requirement it does have--good, supportive shoes--is crucial.
Wiki
This work focuses on one requirement: modularity.
Science
But there is one requirement: Companies looking to raise deals through the FlashFunders platform are required to set up a FlashFund to publicly solicit a portion of their deal.
News & Media
But she had one requirement.
News & Media
But to write fiction, one requirement is that you're willing to put yourself in the imaginative space of that fictional world.
News & Media
Clinton agreed with the refugee intake quota of 65,000, but said the "number one requirement" was to set up a proper screening and vetting system — a topic that has once against flared up as French officials work to determine the nationality of the IS attackers in France.
News & Media
One requirement of this type requires the provision of translation resources that meet real needs.
Science
For time's sake writer decided to inspect autos on display for only one requirement: non-glaring windshield wipers.
News & Media
Just one requirement: Volume must be on full blast.
News & Media
The T-SCE effect on colony growth has only one requirement - the possibility of exchanging unequal quantities of DNA.
Science
Expert writing Tips
Best practice
Use "but one requirement" to clearly indicate that only a single condition needs to be met. This can simplify instructions or emphasize a key element.
Common error
Avoid adding unnecessary clauses or phrases around "but one requirement". Keep the sentence concise and focused on the specific condition.
Source & Trust
83%
Authority and reliability
4.3/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "but one requirement" functions as a conjunction phrase that introduces a single, necessary condition. As supported by Ludwig, the phrase is grammatically correct and usable in written English.
Frequent in
News & Media
35%
Science
33%
Formal & Business
12%
Less common in
Wiki
10%
Encyclopedias
5%
Reference
5%
Ludwig's WRAP-UP
In summary, "but one requirement" is a grammatically correct phrase used to emphasize a single, necessary condition. As Ludwig AI indicates, the phrase is acceptable for use and functions as a conjunction introducing this condition. While the phrase is relatively neutral in tone, context dictates its specific level of formality; it appears most frequently in news, science and business contexts. To ensure clarity, maintain a concise sentence structure when using "but one requirement". Consider alternatives such as "only one condition" or "just a single necessity" for varied expression.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
only one condition
Emphasizes the singularity of the condition.
just a single necessity
Highlights the need as being the sole essential element.
merely one prerequisite
Focuses on the preliminary nature of the requirement.
solely one demand
Stresses the exclusivity of the stipulation.
simply one obligation
Underlines the straightforward nature of the duty.
one and only stipulation
Highlights the unique and binding nature of the requirement.
a singular necessity
Emphasizes the distinct and essential nature of the requirement.
the only need
Directly states that this is the exclusive requirement.
one solitary condition
Highlights that the requirement is on its own and isolated.
just one thing needed
Informal way to express a specific need.
FAQs
How can I use "but one requirement" in a sentence?
You can use "but one requirement" to introduce a single condition or necessity, as in "The project is nearly complete, "but one requirement" remains: we need to finalize the budget."
What phrases are similar to "but one requirement"?
Alternatives include "only one condition", "just a single necessity", or "merely one prerequisite", depending on the nuance you want to convey.
Is it grammatically correct to start a sentence with "but"?
While traditionally discouraged, starting a sentence with "but" is now widely accepted in modern writing, especially for emphasis or to create a conversational tone. In the context of ""but one requirement"", it's perfectly acceptable.
How formal is the phrase "but one requirement"?
The phrase ""but one requirement"" is relatively neutral in tone and can be used in both formal and informal contexts, although more formal alternatives like "only one prerequisite" might be preferred in academic or professional settings.
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
83%
Authority and reliability
4.3/5
Expert rating
Real-world application tested