ground·break·ing

[ground-brey-king]
noun
1.
the act or ceremony of breaking ground for a new construction project.
adjective
2.
of or pertaining to such a ceremony.
3.
originating or pioneering a new endeavor, field of inquiry, or the like: Pasteur's groundbreaking work in bacteriology.

Origin:
1905–10; ground1 + break + -ing1, -ing2

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
groundbreaking

adjective
1. 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" [syn: innovative

noun
1. the ceremonial breaking of the ground to formally begin a construction project 
WordNet® 3.0, © 2006 by Princeton University.
Cite This Source
00:10
Groundbreaking is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Example sentences
It was a groundbreaking superhero comic, but not something you could ever turn
  into a movie.
It was a groundbreaking decision, even for a company with a long history of
  inventions and innovations.
Not every groundbreaking step is the end of the world.
And no one will dispute that he has done groundbreaking work in his career.
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