In simple terms
A first language is the language a person acquires in childhood as a member of a speech community. It is also called a mother tongue or native language, and linguists write it as L1, with languages learned later as L2.
The label describes how a language was learned, not how well someone speaks it or which language they use most as an adult.
How it works
Catalogues of the world’s languages count by first-language communities. Glottolog defines a spoken first language as one traditionally used by a community of speakers as their first language, and as of March 2026 it listed 7,674 of them, alongside 227 sign languages, 87 pidgins and smaller categories, 8,238 entries in all.
How the counting is done changes the answer. Ethnologue’s ranking of the 200 largest languages reports that more than 88 percent of people use one of them as their native tongue, with many hundreds of millions more using them as second languages. That list ranks individual languages rather than macrolanguages, which are groupings of related but distinct varieties, so entries such as Chinese and Arabic are split into separate languages. Include the macrolanguages instead and the ranking changes considerably.
A claim about first-language speakers is therefore only as clear as the unit being counted.
Why it matters
Counts of first-language speakers feed decisions about school language policy, official translation and which languages get keyboards, spell checkers and machine translation. A definition that looks like bookkeeping decides which communities are visible in those decisions.
Where you’ll see it
- Census and school enrollment forms asking which language is spoken at home
- Language catalogues and the identifiers they assign
- Rankings of the world’s largest languages by native speakers
- Language teaching, where first and second language learning are treated differently
Example
Someone raised speaking Yoruba at home and schooled in English has Yoruba as a first language and English as a second, even if English is now the language they read in all day.
Often confused with
A dominant language, meaning the one someone uses most now, and an official language, which is a legal status rather than a fact about childhood.
Key facts
- Glottolog defines a spoken first language as a spoken language traditionally used by a community of speakers as their first language.1
- As of 2 March 2026 Glottolog listed 7,674 spoken first languages, plus 227 sign languages and 87 pidgins, among 8,238 entries in total.1
- Ethnologue reports that over 88 percent of people use one of the 200 largest languages as their native tongue.2
- Ethnologue ranks individual languages rather than macrolanguages, so groupings such as Chinese and Arabic are split into distinct languages.2
Related concepts
Quick checkWhat does the term first language actually describe?Show answer
How the language was acquired, in childhood as a member of a community, rather than how fluent the speaker is now.
Sources
- Glottolog. About Languoids, Glottolog 5.3. Undated, figures dated 2 March 2026 (accessed Accessed 21 October 2026)
- Ethnologue, SIL Global. What are the top 200 most spoken languages?. Undated, 2026 list (accessed Accessed 21 October 2026)
Editorially reviewed by Specialty Digest Editorial TeamLast reviewed October 21, 2026Researched and drafted with AI assistanceReport an issue