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Glottochronology is a quantitative method in historical linguistics for estimating the time depth of divergence between related languages or language varieties from the proportion of shared cognates in a selected set of vocabulary items. It is based on the assumption that lexical replacement occurs at an approximately measurable average rate within a specified lexical domain, commonly basic vocabulary, so that lower cognate retention is interpreted as indicating a longer period since linguistic separation ^[1]. The method typically uses lexicostatistical comparison to identify cognate items and applies a mathematical model of lexical retention to convert the resulting similarity proportion into an estimated date of divergence ^[2]. Glottochronology is therefore distinct from comparative linguistic analysis used to establish genetic relatedness itself: it presupposes a set of related languages and concerns the chronological estimation derived from their lexical correspondence data ^[1][2].