Definition of breakthrough
- a breakthrough in the talks between the region's leaders
- a breakthrough agreement
- a medical breakthrough
- a breakthrough novel
- the actress's breakthrough performance
Researchers say they have made a major breakthrough in cancer treatment.
The police have announced a breakthrough in the murder case.
This job could be the breakthrough she's been waiting for.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'breakthrough.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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Winter Words Quiz