A person's regular occupation, profession, or trade. It's the activity we spend a huge portion of our lives engaged with. Which means we must decide what we want to achieve and what success looks like to us. It might be to make money. It might be to be feel important. It might be wear a fancy suit. It might be to challenge ourselves. It might be lead or help others. Or it might simply to be feel proud and satisfied that we made it our business to make some positive contribution to the world. But that's your business.