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
a trio of
Grammar usage guide and real-world examplesUSAGE SUMMARY
"a trio of" is correct and usable in written English.
You would use it when referring to a group of three persons or things. For example: "The three boys formed a trio of troublemakers."
✓ Grammatically correct
News & Media
Science
Formal & Business
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
60 human-written examples
A trio of traits.
News & Media
The State had a trio of lawyers.
News & Media
A trio of jihadists is seen plotting.
News & Media
A trio of Englishmen were discussing cats.
News & Media
A trio of drummers showed up.
News & Media
What a trio of words.
News & Media
Still, a trio of one composer's symphonies!
News & Media
A trio of new American operas.
News & Media
It is a trio of wonderful performances.
News & Media
A trio of crème brûlées escaped cliché.
News & Media
A trio of singles off this over.
News & Media
Expert writing Tips
Best practice
Use "a trio of" to add a touch of elegance or sophistication when referring to three items or people, especially in creative or descriptive writing. However, prefer "a group of three" in formal contexts.
Common error
Avoid using "a trio of" excessively in formal or technical writing where a more straightforward phrase like "three" or "a group of three" would be more appropriate.
Source & Trust
87%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "a trio of" functions as a determiner followed by a noun. It modifies the following noun, indicating that there are three of that noun. According to Ludwig, the phrase is correct and usable in written English.
Frequent in
News & Media
70%
Science
15%
Formal & Business
15%
Less common in
Academia
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, "a trio of" is a grammatically sound and versatile phrase used to describe a group of three items or individuals. As Ludwig AI confirms, it's perfectly acceptable in written English. While it appears most frequently in news and media, its usage spans various contexts. For more formal settings, consider alternatives like "a group of three" or simply "three" to maintain a professional tone. Be careful not to overuse it in formal writing and make it sound repetitive. Top authoritative sources like The New York Times and The Guardian commonly employ this phrase, affirming its widespread acceptance.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
a set of three
This alternative is a more direct and less figurative way of saying "a trio of".
a group of three
This alternative is very similar, replacing the more evocative "trio" with the more neutral "group".
three of
This alternative is a shortened version, suitable for less formal contexts.
a triad of
This alternative uses a synonym for "trio" that is slightly more formal and less common.
a threesome of
This alternative has a slightly different connotation, sometimes implying a closer or more intimate relationship between the three.
a triple of
This alternative is less common and might be used in specific contexts where "triple" is more appropriate.
a cluster of three
This alternative emphasizes the proximity or arrangement of the three items.
three united
Focuses on the unity, or single nature of the three entities.
three combined
Highlights the act of joining or merging three elements.
an assembly of three
Refers to gathering or meeting that constitutes three members.
FAQs
How do I use "a trio of" in a sentence?
You can use "a trio of" to describe any group of three things or people. For example, "a trio of musicians played at the event" or "a trio of experts analyzed the data".
What can I say instead of "a trio of"?
You can use alternatives like "a group of three", "a set of three", or simply "three" depending on the context.
Is "a trio of" formal or informal?
"A trio of" is generally considered to be a slightly more elevated or descriptive phrase than simply saying "three". It is suitable for most writing contexts but might be replaced by simpler phrasing in very formal or technical documents.
What is the difference between "a trio of" and "a triad of"?
While both "a trio of" and "a triad of" refer to a group of three, "a trio of" is more commonly used and widely understood. "A triad of" might be seen as more formal or technical.
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
4.6/5
Expert rating
Real-world application tested