Glottochronology assumes that the rate at which a language's core vocabulary changes is variable and thus can determine which of two or more languages is changing most rapidly.

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Glottochronology is based on the assumption that the rate at which a language's core vocabulary changes is constant, not variable, over time, which allows for the estimation of the time of divergence between languages.

Glottochronology Assumes That the Rate at Which a Language's Core