› to do or ​finish something successfully; ​achieve something: On ​retiring from the ​Congress, he said he had accomplished everything he set out to do. (Definition of accomplish from the Cambridge Academic Content Dictionary © Cambridge University Press). to do or ​finish something successfully; ​achieve something: On ​retiring from the ​Congress, he said he had accomplished everything he set out to do. (Definition of accomplish from the Cambridge Academic Content Dictionary © Cambridge University Press).