noun (used with a singular verb) Linguistics.
the statistical study of the vocabulary of a language or languages for historical purposes.

1955–60; lexic(on) + -o- + statistics

lexicostatistic, lexicostatistical, adjective
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World English Dictionary
lexicostatistics (ˌlɛksɪkəʊstəˈtɪstɪks)
(functioning as singular) See also glottochronology the statistical study of the vocabulary of a language, with special attention to the historical links with other languages

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