official job / group
1 [C] an important official job that a person or group of people is given to do, especially when they are sent to another country:
a trade mission to China * a fact-finding mission * a mercy mission to aid homeless refugees
2 [C] a group of people doing such a job; the place where they work:
the head of the British mission in Berlin
teaching christianity
3 [C,U] the work of teaching people about Christianity, especially in a foreign country; a group of people doing such work:
a Catholic mission in Africa * Gandhi's attitude to mission and conversion
4 [C] a building or group of buildings used by a Christian mission
your duty
5 [C] particular work that you feel it is your duty to do:
Her mission in life was to work with the homeless.
of armed forces
6 [C] an important job that is done by a soldier, group of soldiers, etc:
The squadron flew on a reconnaissance mission.
space flight
7 [C] a flight into space:
a US space mission * mission control (= the people on earth who control and communicate with the people on the mission)
IDIOMS
mission accomplished used when you have successfully completed what you have had to do:
Mission accomplished. Let's go and have a drink.
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