glottochronology
Noun
Meaning
the determination of how long ago different languages evolved from a common source language
Source: WordNetSynonyms
Hypernyms
Examples
he mapped the glottochronology of the Romance languages
Scholars posit a split between the groups in the distant past, perhaps 3500–3800 years ago. citation Glottochronology studies suggest the split occurred between about 1,500 and 1,800 BCE.