Meaning of “failure” - Learner’s Dictionary

failure

noun uk us /ˈfeɪljər/
NO SUCCESS [ U ]

B2 a situation in which someone or something does not succeed:

Their attempt to climb Everest ended in failure.
PERSON/ACTION [ C ]

B2 someone or something that does not succeed:

All my life I've felt like a failure.
failure to do sth

B2 a situation in which you do not do something that you must do or are expected to do:

Failure to pay within 14 days will result in prosecution.
NOT WORKING [ C, U ]

B2 a situation in which something does not work, or stops working as well as it should:

heart failure
All trains were delayed due to a power failure.

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