breakthrough

Pronunciation

• IPA ^(key): /ˈbreɪkθruː/

• Audio (US)

  (file)

Noun

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.