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mission

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noun British English pronunciation: mission /ˈmɪʃ(ə)n/ 
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singularmission
pluralmissions
 
  1. 1
    [countable] an important piece of work that a person or group of people has to do for a government or large organization, especially one that involves travel

    The President leaves for a trade mission to the Middle East.

    a cultural/fact-finding/rescue mission

    1. a.
      a group of people sent to do an important piece of work

      The UN peacekeeping mission has arrived in the capital.

  2. 2
    [countable] a military operation, especially one by aircraft

    He was shot down during a mission over the Balkans.

  3. 3
    [countable] a flight into space

    the possibility of a manned mission to Mars

  4. 4
    [singular] an aim that is very important to a person or organization
    mission in life (=a personal goal):

    Helping homeless people was Gina's mission in life.

    mission to do something:

    It is the international community's mission to end terrorism.

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