From dictionary.com:
busi⋅ness /ˈbɪznɪs/ [biz-nis]
–noun
1. an occupation, profession, or trade: His business is poultry farming.
2. the purchase and sale of goods in an attempt to make a profit.
3. a person, partnership, or corporation engaged in commerce, manufacturing, or a service; profit-seeking enterprise or concern.
4. volume of trade; patronage: Most of the store's business comes from local families.
5. a building or site where commercial work is carried on, as a factory, store, or office; place of work: His business is on the corner of Broadway and Elm Street.
6. that with which a person is principally and seriously concerned: Words are a writer's business.
7. something with which a person is rightfully concerned: What they are doing is none of my business.
8. affair; project: We were exasperated by the whole business.
9. an assignment or task; chore: It's your business to wash the dishes now.
10. Also called piece of business, stage business. Theater. a movement or gesture, esp. a minor one, used by an actor to give expressiveness, drama, detail, etc., to a scene or to help portray a character.
11. excrement: used as a euphemism.