first language

== English == === Etymology === From first +‎ language. === Noun === first language (plural first languages) The first language one is taught to speak; one's native language. Synonyms: native language, mother tongue, mother language The language one feels most comfortable and capable with. Used other than figuratively or idiomatically: see first,‎ language. ==== Translations ==== === See also === mother tongue second language === References === “first language”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.