glottochronology
noun
glot·to·chro·nol·o·gy
ˌglä-tō-krə-ˈnä-lə-jē 
: a linguistic method that uses the rate of vocabulary replacement to estimate the date of divergence for distinct but genetically related languages
Dictionary Entries Near glottochronology
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“Glottochronology.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/glottochronology. Accessed 18 Apr. 2024.
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