Calling (noun)

1. A strong inner impulse towards a particular career or occupation.
2. The act of making a telephone call.
3. A profession, trade or vocation.

Origin:

Middle english, from old english cȳðing; akin to old high german kiuting call, latin citare to call, greek kathizesthai to sit down.

Examples:

1. He felt a calling to be a priest.
2. She made a calling to her friend.
3. Teaching is his calling.
4. He felt a calling to help others.
5. It's her calling to be a nurse.