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основополагающий meaning in English

RussianEnglish
основополагающий adjective

fundamental(pertaining to the foundation or basis; serving for the foundation)
adjective
[UK: ˌfʌn.də.ˈmen.tl̩] [US: ˌfʌn.də.ˈmen.tl̩]

seminal(highly influential)
adjective
[UK: ˈse.mɪn.l̩] [US: ˈse.mən.l̩]