groundbreaking(s = adj.all) innovational, innovative - being or producing something like nothing done or experienced or created before; "stylistically innovative works"; "innovative members of the artistic community"; "a mind so innovational, so original"
The ceremonial breaking of the ground to formally begin a construction project. It is sometimes carried out by an official who digs the first spadeful of dirt from the ground, to begin the preparatory excavation work. [WordNet 1.5]