interest

The price paid for obtaining, or price received for providing, money or goods in a credit transaction, calculated as a fraction of the amount or value of what was borrowed.

"Our bank offers borrowers an annual interest of 5%."

Any excess over and above an exact equivalent

A great attention and concern from someone or something; intellectual curiosity.

"He has a lot of interest in vintage cars."

To engage the attention of; to awaken interest in; to excite emotion or passion in, in behalf of a person or thing.

"Action films don't really interest me."

To be concerned with or engaged in; to affect; to concern; to excite.

To cause or permit to share.