mission

mission /ˈmɪʃən/ noun
plural missions
mission
/ˈmɪʃən/
noun
plural missions
Britannica Dictionary definition of MISSION
[count]
1 
a  : a task or job that someone is given to do
b  : a specific military or naval task
c  : a flight by an aircraft or spacecraft to perform a specific task
— see also mission control
2 
: a task that you consider to be a very important duty
3 
: a group of people sent to a foreign country for a specific reason (such as to have discussions or to provide training or assistance)
4 
a  : a group of people who are sent to a foreign country to do religious work : a group of missionaries
b  : a place or building where such work is done