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maternal

Examples
In a sentence
Materský jazyk je slovenčina.
His mother tongue is Slovak.
Materská škola otvára nové oddelenie.
The kindergarten is opening a new class.
Hovorí plynule svojím materským jazykom.
She speaks her mother tongue fluently.
Materská škola otvára zápis v marci.
The kindergarten opens enrollment in March.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.