mission

noun (C)

1 AIRFORCE/ARMY ETC an important job done by a member of the airforce, army etc, especially an attack on the enemy: He was sent on over 200 missions before being killed in action. | a space mission

2 GOVERNMENT/GROUP a group of important people who are sent by their government to another country to discuss something or collect information: a British trade mission to Moscow

3 JOB an important job that someone has been given to do especially when they are sent to another place: His mission was to improve staff morale and output.

4 DUTY something that you feel you must do because it is your duty: mission in life: He always felt that his mission in life was to help old people.

5 RELIGION

a) the work of a religious leader or organization, that has gone to a foreign country, in order to teach people about Christianity or help poor people: After he trained as a priest he went to work for the missions in Africa.

b) a building where this kind of work is done

6 mission accomplished used when you have finished a job that someone has asked or told you to do