Interest
4. concern; importance:
a matter of primary interest.
5.
a business, cause, or the like in which a person has a share, concern,responsibility, etc.
6.
a share, right, or title in the ownership of property, in a commercial or financial undertaking, or the like:
He bought half an interest in the store.
7.
a participation in or concern for a cause, advantage, responsibility,etc.