groundbreaking

[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. 2014.
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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.
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Example sentences
It was not exactly what you would call groundbreaking stuff.
Although highly readable, the book includes no groundbreaking historical research.
There does not seem to be anything new and groundbreaking behind this framework.
Demonstrations will offer the chance for visitors to participate and learn
  about the science behind these groundbreaking flights.
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