Word #10: “glottochronology” (n.)

n. [Linguistics]

  1. The application of statistics to vocabulary to determine the degree of relationship between two or more languages and the chronology of their splitting off from a common ancestor.

Or, as its conceiver Morris Swadesh hypothesized, “[i]f we can show by means of comparative linguistics that various people spoke similar languages sometime in the past, we can infer the identities of those predecessor languages, and thus even more intimate connections between all human cultures … arriving eventually at an original tongue” (quoted in About a Mountain, 126)