(noun) A set of tasks that fulfills a purpose or duty; an assignment set by an employer, or by oneself.
"My mission in life is not merely to survive, but to thrive; and to do so with some passion, some compassion, some humor, and some style."
"Each of us is merely a small instrument; all of us, after accomplishing our mission, will disappear."
"My mission is healing, pure and simple."