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say it: GROWND-bray-king
groundbreaking is a noun and adjective meaning "the ceremonial breaking of the ground to formally begin a construction project". It carries 2 recorded senses.
the ceremonial breaking of the ground to formally begin a construction project
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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for groundbreaking come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.