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English definition of “effort”

effort

noun [C/U]    /ˈef·ərt/
physical or mental activity needed to achieve something, or an attempt to do something: [C] They met again in an effort to end the strike and get people back to work. [U] It took years to write the book, but it was worth the effort. [U] He established the Help Committee to coordinate the relief effort. [C] Efforts to reach the senator for comment were not successful.
(Definition of effort noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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