言げん語ご年ねん代だい学がく

noun

glottochronology

A technical term in historical linguistics for estimating the time depth of language divergence based on core vocabulary retention rates.

• 言げん語ご年ねん代だい学がくは、基き礎そ語ご彙いの残ざん存そん率りつから言げん語ごの分ぶん岐き年ねん代だいを推すい定ていする方ほう法ほうです。

  Glottochronology is a method that estimates the divergence dates of languages from the retention rates of basic vocabulary.