The phrase "pioneering effort" refers to being the first to do something new or different. It implies being innovative and taking risks to explore uncharted territory. Full definition
These early pieces are a testament to the artist's interest and pioneering efforts in site - specific projects, as well as in the medium of drawing. (minusspace.com)
In short, they developed pioneering efforts to adapt to adverse local conditions and define sustainable development paths. (ipcc.ch)
And much of that has to do with being given the opportunity to celebrate the life and pioneering efforts of Billie Jean King, on every level, for all her varied achievements. (awardsdaily.com)