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English definition of “mission”

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mission

noun uk   /ˈmɪʃ.ən/ us  

mission noun (JOB)

C2 [C] an important job, especially a military one, that someone is sent somewhere to do: Your mission is to isolate the enemy by destroying all the bridges across the river. a peace/rescue/fact-finding missionB2 [C] any work that someone believes it is their duty to do: My mission in life is to educate the rich about the suffering of the poor. She's a woman with a mission and she's absolutely determined to finish the project.mission accomplished something that you say when you have finished doing something that you were told to do: Mission accomplished. I've got everything you asked for on the list.
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mission noun (PEOPLE)

[C, + sing/pl verb] a group of people whose job is to increase what is known about their country, organization, or religion in another country or area, or the place where such people are based: More funds are needed to establish trade missions in eastern Europe. The Methodist mission is situated in one of the poorest parts of the city.
(Definition of mission from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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