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
is only true
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "is only true" is correct and usable in written English.
You can use it when discussing the validity or accuracy of a statement or claim, often to emphasize a limitation or condition. Example: "The theory is only true under specific circumstances, which must be taken into account."
✓ Grammatically correct
Science
News & Media
Alternative expressions(2)
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
59 human-written examples
That is only true technically.
News & Media
That is only true if Inauguration Day seems far away.
News & Media
But that is only true to a degree.
News & Media
This is only true if Hugh Hefner is your dad.
News & Media
Of course, that is only true if the shows succeed.
News & Media
But that is only true of a relatively small proportion of legal services.
News & Media
But this is only true in respect of Jewish students who are Zionist.
News & Media
This is only true for people who buy coverage through the marketplace.
News & Media
But that is only true if the burden on women for whom the law is relevant is, indeed, undue.
News & Media
This is only true if you don't count part-time students, whose numbers have dropped 41 per cent.
News & Media
But this is only true in a flat universe.
News & Media
Expert writing Tips
Best practice
When using "is only true", clearly state the condition or context that makes the statement valid to avoid ambiguity. For example, "This method is only true if the sample size is large enough."
Common error
Avoid presenting a statement as universally true when it "is only true" under specific conditions. Failing to specify those conditions can mislead readers and undermine your argument.
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "is only true" functions as an adverbial phrase that modifies a statement. As Ludwig AI indicates, it introduces a condition or limitation that must be met for the statement to be valid. Examples in Ludwig show it frequently used to qualify generalizations.
Frequent in
Science
39%
News & Media
37%
Formal & Business
0%
Less common in
Encyclopedias
0%
Wiki
2%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "is only true" is a common and grammatically correct way to introduce a condition that limits the validity of a statement. As Ludwig AI notes, it's essential to specify the condition clearly to avoid misinterpretations. The phrase appears frequently in scientific and news-related contexts, and while versatile, its use should be carefully considered to prevent overgeneralizations. Alternatives like "is accurate only when" or "holds true solely if" can provide similar nuances. By understanding its function and potential pitfalls, writers can effectively use "is only true" to create nuanced and accurate statements.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
is true merely if
Emphasizes a single condition that makes something true.
is accurate only when
Highlights the accuracy being conditional on specific circumstances.
holds true solely if
Stresses the exclusivity of the condition for the statement to hold.
is valid exclusively if
Focuses on the validity being tied to a particular condition.
applies solely under
Indicates that the application of something is limited to certain conditions.
is conditional upon
Highlights the dependence of the statement's truth on a specific condition.
is just true given
Suggests that the truth is justified by certain conditions.
is correct under
States that the correctness is confined to specific conditions.
is truthful only
Emphasizes the limited truthfulness of the statement.
is right strictly when
Indicates that correctness is limited to strict conditions.
FAQs
How do I use "is only true" in a sentence?
Use "is only true" to specify the limited conditions under which a statement holds. For example, "That statement "is only true" if we ignore external factors."
What can I say instead of "is only true"?
You can use alternatives like "is true merely if", "is accurate only when", or "holds true solely if" depending on the context.
When is it appropriate to use the phrase "is only true"?
Use "is only true" when you need to emphasize that a statement is not universally valid and depends on certain conditions or circumstances being met.
What's the difference between "is only true" and "is always true"?
"Is only true" indicates a conditional truth, whereas "is always true" implies a universal truth, valid in all situations. The former is restrictive, while the latter is absolute.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested