breakthrough

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Pronunciation[change]

  • IPA: /ˈbreɪkθruː/
  • (file)

Noun[change]

Singular
breakthrough

Plural
breakthroughs

  1. A breakthrough is a sudden change, a change from not being able to do something to being able to do something.
    After the breakthrough, rubber could be made in a factory and rubber trees were no longer the only source of rubber.