From Longman Dictionary of Contemporary Englishgroundbreakingground‧break‧ing /ˈɡraʊndˌbreɪkɪŋ/ adjective NEWgroundbreaking work involves making new discoveries, using new methods etc groundbreaking research
Examples from the Corpus
groundbreaking• MacKinnon's groundbreaking legal work changed the way sexual harassment was viewed.• Other groundbreaking work was reportedly done in the areas of fault tolerance support and compiler optimisation. 