1.
official language
A language designated for use in government, law, and official business of a country or region. A country may have one or multiple official languages.
Japan has no legally designated 公用語 — Japanese is the de facto national language but is not formally codified as the official language in the constitution.
Common collocations
Similar words
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国語 (national language)
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母語 (mother tongue, native language)
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第二言語 (second language)