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groundbreaking

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

First recorded in 1905–10; ground1 + break + -ing1, -ing2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for ground-breaking

ground-breaking

adjective
  1. innovativea ground-breaking novel
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ground-breaking

groundbreaking

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper