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
proficiency in
Grammar usage guide and real-world examplesUSAGE SUMMARY
"proficiency in" is correct and usable in written English.
You can use it to describe someone's ability in a certain activity or skill. Example: She demonstrated a high level of proficiency in Spanish.
✓ Grammatically correct
Academia
News & Media
Science
Formal & Business
Wiki
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
Many jobs require proficiency in Irish.
News & Media
Determine your level of proficiency in English.
News & Media
Proficiency in calculus essential.
Academia
Prerequisites: reading proficiency in Polish.
Academia
Prerequisite: proficiency in multivariate calculus.
Academia
Prerequisites: Proficiency in Arabic required.
Academia
Proficiency in arranging Illusory Public Offerings (I.P.O.'s) required.
News & Media
An extra section, which is optional, tests proficiency in Spanish.
News & Media
The company's proficiency in software and data crunching is unquestioned.
News & Media
(c) Correlation between GMV decrease and unicyling proficiency in rSTG.
Science & Research
Proficiency in interpersonal, interpretive, and presentational communication.
Academia
Expert writing Tips
Best practice
When describing abilities, use "proficiency in" to highlight a developed skill or competence in a specific area. For example, "She has a high level of proficiency in data analysis."
Common error
Avoid using "proficiency at" as it is less common and grammatically awkward. "Proficiency in" is the standard and preferred construction.
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "proficiency in" functions as a noun phrase complemented by a preposition, indicating a level of skill or competence. It is commonly used to specify the area in which someone possesses a certain level of ability. Ludwig AI confirms that the phrase is correct and usable.
Frequent in
Academia
32%
News & Media
20%
Science
16%
Less common in
Formal & Business
12%
Wiki
4%
Reference
0%
Ludwig's WRAP-UP
In summary, "proficiency in" is a grammatically sound and frequently used phrase for indicating skill or competence in a specific area. Ludwig AI confirms its correctness and usability. It is most common in academic, news, and scientific contexts. While alternatives like "expertise in" and "competence in" exist, "proficiency in" remains a versatile and widely accepted choice. Remember to avoid the less common "proficiency at". Using "proficiency in" effectively communicates the level of skill required or possessed in various domains.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
expertise in
Emphasizes specialized knowledge or skill acquired through experience.
competence in
Highlights the ability to perform a task successfully.
mastery of
Suggests a comprehensive and deep understanding or control of a subject.
skill in
Focuses on a developed talent or ability.
aptitude for
Implies a natural inclination or potential for success.
fluency in
Specifically refers to the ability to use a language easily and accurately.
capability in
Indicates the potential or capacity to perform something.
qualifications in
Points to formal certifications or training.
command of
Suggests a strong and authoritative control or knowledge.
understanding of
Emphasizes comprehension and knowledge rather than practical skill.
FAQs
How do you use "proficiency in" in a sentence?
Use "proficiency in" to describe someone's skill or competence in a particular area. For example, "The job requires "proficiency in English"".
What's the difference between "proficiency in" and "expertise in"?
"Proficiency in" indicates a general competence or skill, while "expertise in" suggests a higher level of specialized knowledge and experience.
What are some alternatives to "proficiency in"?
You can use alternatives such as "skill in", "competence in", or "mastery of" depending on the specific context.
Is it correct to say "proficiency at" instead of "proficiency in"?
While not strictly incorrect, "proficiency in" is the more widely accepted and grammatically standard form. "Proficiency in" is almost always preferable.
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
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested