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break·through

breakthrough

 
 
pronunciation:
breIk thru
part of speech: noun
definition: an important discovery in a particular field. A breakthrough solves a problem that has been preventing progress in achieving something or in gaining greater knowledge of something.
The discovery of penicillin was a tremendous breakthrough in the treatment of disease.The inventor finally had a breakthrough which solved his problem in getting the invention to work.
antonyms:
setback