New American Oxford Dictionary
groundbreaking
ground break ing |ˈgroundˌbrākiNG ˈɡraʊndbreɪkɪŋ | ▶adjective breaking new ground; innovative; pioneering. DERIVATIVES ground break er |-ˌbrākər |noun
Oxford Dictionary
groundbreaking
ground |break |ing |ˈɡraʊndbreɪkɪŋ | ▶adjective innovative; pioneering: groundbreaking research into fertility problems. DERIVATIVES groundbreaker noun
American Oxford Thesaurus
groundbreaking
groundbreaking they applaud this groundbreaking legislation: innovative, fresh, unusual, unprecedented, inventive; advanced, state-of-the-art, pioneering, revolutionary, radical; important, noteworthy, newsworthy. WORD TOOLKIT Word Toolkits illustrate the difference between close synonyms by means of words typically used with them.
Sanseido Wisdom Dictionary
groundbreaking
gr ó und br è aking 形容詞 1 革新的な .2 起工 (式 )の .名詞 C 起工式, くわ入れ式 .