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"A person who advocates thorough or complete political or social change, or a member of a political party or section of a party pursuing such aims.",
"A group of atoms behaving as a unit in a number of compounds.",
"The root or base form of a word.",
"Any of the basic set of approximately 214 Chinese characters constituting semantically or functionally significant elements in the composition of other characters and used as a means of classifying characters in dictionaries.",
"A quantity forming or expressed as the root of another.",