From The Collaborative International Dictionary of English v.0.48 [gcide]:
3. Specfically: The principal business of one's life; the principal work by which one earns one's livelihood; vocation; employment; profession; calling; trade; avocation; as, these days many people continue to practice their occupation well into their seventies. [1913 Webster +PJC]
From WordNet (r) 3.0 (2006) [wn]:
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