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The meaning of groundbreaking is introducing new ideas or methods. If something is groundbreaking, it is very new and a big change from other things of its … Definition of groundbreaking adjective in oxford advanced learners dictionary. How to use groundbreaking in a sentence. Originating or pioneering a new endeavor, field of inquiry, or the like. Adjective of or relating to such a ceremony. Meaning, pronunciation, picture, example … You use groundbreaking to describe things which you think are significant because they provide new and positive ideas, and …