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breakthrough [breakthroughs]▼(major progress)noun[UK: ˈbreɪk.θruː] [US: ˈbreɪk.ˌθruː]
breakthrough [breakthroughs]▼(military advance)noun[UK: ˈbreɪk.θruː] [US: ˈbreɪk.ˌθruː]
breakthrough▼(characterized by major progress)adjective[UK: ˈbreɪk.θruː] [US: ˈbreɪk.ˌθruː]
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