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The application of techniques of lexicostatistics to study the evolution and establish the relationship between languages and therefore populations and to estimate how long ago they diverged from their common source, believed by many authorities to have been in Africa approximately 150,000 years ago. See also Indo-European. Compare evolutionary clock, mitochondrial DNA. [From Greek glotta, Attic form of Ionic glossa a tongue + chronos time + logos word, discourse, or reason]

Subjects: Psychology.

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