Mother-tongue - Glossary of Translation
One's native language. Often used as an indicator of a translator or interpreter's ability to translate into a particular language. Because a person who has lived in another country for many years (perhaps from childhood) may be more fluent in their „new” language than they are in their original mother-tongue, the terms -language of habitual use, dominant language and native language are often used instead. (from trans-k.co.uk)
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