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English definition of “failure”

failure

noun uk   /ˈfeɪ.ljər/ us    /-ljɚ/

failure noun (NO SUCCESS)

B2 [C or U] the fact of someone or something not succeeding: The meeting was a complete/total failure. I'm a bit of a failure at making (= I cannot make) cakes. I feel such a failure (= so unsuccessful). Their attempt to climb the Eiger ended in failure. The whole project was doomed to failure right from the start (= it could never have succeeded).

failure noun (NOT DO)

B2 [U + to infinitive] the fact of not doing something that you must do or are expected to do: His failure to return her phone call told her that something was wrong. Failure to keep the chemical at the right temperature could lead to an explosion.

failure noun (STOP)

B2 [C or U] the fact of something not working, or stopping working as well as it should: He died of heart/liver failure. The accident was caused by the failure of the reactor's cooling system. The number of business failures rose steeply last year. After three crop failures in a row, the people face starvation.
(Definition of failure from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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