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groundbreaking

[ground-brey-king] /ˈgraʊndˌbreɪ kɪŋ/
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
1905-1910
1905-10; ground1 + break + -ing1, -ing2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for more groundbreaking

groundbreaking

adj.

1907 as a figurative adjective, from expression to break ground, either for planting or for building; see ground (n.) + break (v.).

Online Etymology Dictionary, © 2010 Douglas Harper
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