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First language - Wikipedia
The Definition of Mother Tongue Plus the World's Top 20
Mother tongue Definition & Meaning - Merriam-Webster
“Mother Tongue” vs. “Native Language” - Difference Explained …
MOTHER TONGUE | English meaning - Cambridge Dictionary
A border split my family's language. Now I'm bringing it back - BBC
6 Minute English / Why's it called 'mother tongue'? - BBC
mother tongue - Wiktionary, the free dictionary
mother tongue noun & adjective - Oxford English Dictionary
Mother Tongue, Defining the Mother Language - Bilingual Kidspot