(a strong desire to work in) an occupation, profession or trade

chosen profession

a group of people sent abroad to perform a special task; a place where missionaries work or where charitable or medical work is carried on among poor people

person's task, responsibility

an occupation, especially one needing advanced education and special training, e.g. the law, teaching, medicine

line of work requiring academic or practical preparation

the feeling that one is called to (and qualified for) a certain kind of work (especially social or religious); a special ability (for something); a person's trade or profession

life's work