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English definition of “Proto-Indo-European”

Proto-Indo-European

noun [U]     /ˌprəʊ.təʊ.ˌɪn.dəʊˌjʊə.rəˈpiː.ən/ US  /ˌproʊ.t̬oʊˌɪn.doʊˌjʊr.əˈ-/ (abbreviation PIE)
the ancient language, of which there are no records, that experts think Indo-European languages developed from
(Definition of Proto-Indo-European noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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