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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 of glottochronology
1950-1955
1950-55; glotto- + chronology
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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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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