Englishfor English speakers
actinide
Noun
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An actinide is a chemical element with an atomic number between 89 and 103.
family
Noun
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A family is a group of people with a blood or marriage relation.
My parents and my two brothers are my family.
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A language family is a group of languages that is believed to have came from the same language.
The Indo-European language family is a family of languages that is spoken by 3 billion people.