Definition from macmillandictionary.com
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The President leaves for a trade mission to the Middle East.
a cultural/fact-finding/rescue mission
The UN peacekeeping mission has arrived in the capital.
He was shot down during a mission over the Balkans.
the possibility of a manned mission to Mars
Helping homeless people was Gina’s mission in life.
It is the international community’s mission to end terrorism.
the Catholic mission in Papua New Guinea