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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
first language
Grammar usage guide and real-world examplesUSAGE SUMMARY
"first language" is correct and usable in written English.
It is used to indicate the language a person initially learns as a child, such as the language of their parents or the language of their native country. Example: English is my first language, but I'm also proficient in French.
✓ Grammatically correct
News & Media
Encyclopedias
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
60 human-written examples
My first language is Xhosa.
News & Media
Her first language was Dutch.
Encyclopedias
That's my first language.
News & Media
This Pope's first language is Spanish.
News & Media
"Their first language is Spanish," he said.
News & Media
And English is not his first language.
News & Media
The family's first language was Yiddish.
News & Media
They speak Mandarin as a first language.
Encyclopedias
His first language is Welsh.
News & Media
His first language was Yiddish.
News & Media
French was my first language.
News & Media
Expert writing Tips
Best practice
When discussing multilingual individuals, clearly specify which language is their "first language" to avoid ambiguity.
Common error
Avoid assuming that a person's "first language" is necessarily the language they are most fluent in. A person might be more proficient in a language they learned later due to education or environment.
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "first language" functions as a noun phrase, typically used as a subject complement or object in a sentence. It identifies and labels the initial language acquired by an individual. Ludwig AI confirms its proper usage in English.
Frequent in
News & Media
39%
Science
31%
Encyclopedias
5%
Less common in
Wiki
2%
Formal & Business
0%
Reference
0%
Ludwig's WRAP-UP
The phrase "first language" is a grammatically sound and frequently used term to denote the language a person learns from birth. As Ludwig AI confirms, it's a common term used across various contexts, including news, science, and encyclopedias. While often interchangeable with terms like "native language" or "mother tongue", it's crucial to remember that fluency isn't always tied to one's "first language", as proficiency can shift with education and environment. When discussing someone's linguistic background, specifying their "first language" adds clarity and precision.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
native language
Direct synonym for "first language", emphasizing the language one is born into.
first learned language
Explicitly states that it is the language learned initially.
native tongue
Replaces "first language" with a more poetic and traditional term, emphasizing the innate connection to the language.
mother tongue
Similar to "native tongue", this term highlights the language one learns from their mother or primary caregiver.
maternal language
Highlights the influence of the mother in language acquisition, similar to "mother tongue".
primary language
Focuses on the language someone uses most frequently and is most comfortable with.
childhood language
Highlights the language learned during the early years of life.
language of origin
Emphasizes the language from one's cultural or ethnic background.
language one grew up with
Describes the language environment during childhood development.
strongest language
Focuses on proficiency and comfort level with a particular language.
FAQs
What's the difference between "first language" and "second language"?
"First language" refers to the language a person learns from birth or as a young child, while "second language" refers to a language learned later in life.
What are some other terms for "first language"?
Synonyms for "first language" include "native language", "mother tongue", and "primary language".
How do you determine a person's "first language"?
A person's "first language" is typically determined by the language they were initially exposed to and learned during childhood, often the language spoken at home.
Is it possible to have more than one "first language"?
Yes, it's possible to be bilingual or multilingual from a young age, effectively having multiple "first languages".
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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
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested