Meaning of “responsibility” - Learner’s Dictionary

responsibility

noun uk us /rɪˌspɒnsəˈbɪləti/

B2 [ C, U ] something that it is your job or duty to deal with:

The head of the department has various additional responsibilities.
[ + to do sth ] It is your responsibility to make sure that your homework is done on time.
take/accept/claim responsibility for sth

B2 to say that you have done something or caused something to happen, especially something bad:

No one has yet claimed responsibility for yesterday's bomb attack.

(Definition of “responsibility” from the Cambridge Learner’s Dictionary © Cambridge University Press)