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Definition of Proto-Indo-European
1. Proper noun. (context: linguistics uncountable) The hypothetical ancestor language or protolanguage of the Indo-European family of languages, which includes most European and Indian languages. ¹
2. Proper noun. (context: anthropology countable) A person who spoke the Proto-Indo-European language. ¹
3. Adjective. (context: linguistics anthropology) Of or pertaining to the Proto-Indo-European language, or the people who spoke it. ¹
¹ Source: wiktionary.com