First language means —— language (find the appropriate word for the blank space)

Explanation:

Correct Answer is: natural

A first language, native tongue, native language, or mother/father/parent tongue (also known as arterial language or L1) is a language or dialect that a person has been exposed to from birth or within the critical period. In some countries, the term native language or mother tongue refers to the language of one`s ethnic group rather than one`s first language.