/ ˌpaɪəˈnɪərɪŋ; NAmE -ˈnɪr-/ adjective
[ usually before noun ] introducing ideas and methods that have never been used before :
pioneering work on infant mortality
the pioneering days of radio
/ ˌpaɪəˈnɪərɪŋ; NAmE -ˈnɪr-/ adjective
[ usually before noun ] introducing ideas and methods that have never been used before :
pioneering work on infant mortality
the pioneering days of radio
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005