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glottochronology

[glot-oh-kruh-nol-uh-jee, glot-uh-] /ˌglɒt oʊ krəˈnɒl ə dʒi, ˌglɒt ə-/
noun, Linguistics
1.
the branch of lexicostatistics that studies the rate of replacement of vocabulary and attempts to determine what percentage of basic vocabulary two presently distinct but related languages share, using the information thus obtained to estimate how long ago they ceased being a single language.
Origin
1950-1955
1950-55; glotto- + chronology
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for glottochronology

glottochronology

/ˌɡlɒtəʊkrəˈnɒlədʒɪ/
noun
1.
the use of lexicostatistics to establish that languages are historically related
Word Origin
C20 glotto-, from Greek glōtta tongue
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for glottochronology
n.

1953, from glotto- + chronology.

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for glottochronology

the study of the rate of change occurring in the vocabularies of languages for the purpose of calculating the length of time (time depth) during which two related languages have developed independently. Glottochronology rests upon statistical comparison of the basic vocabulary shared by two or more related languages and on the assumption that the rate of vocabulary replacement is constant over sufficiently long periods of time. A number of linguists do not accept the methods or findings of glottochronology, for two reasons: the difficulty of compiling a culturally unbiased basic vocabulary list and the belief that the rate of linguistic change is not the same for all languages and is not constant for any single language.

Learn more about glottochronology with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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