(law) An indefeasible right or title, distinguished from a contingent interest, which could be defeated (i.e. cease) if a certain event occurred.

(law) A situation in which an individual or legal entity in a position of trust (such as an attorney, investment advisor, broker, politician, executive, director, scientist or physician) has competing professional or personal interests.

The act of one caring for or one's interest over something.

(finance) The percentage of an amount of money charged for its use per some period of time (often a year).

(finance) The total number of contracts outstanding between market participants in a market for futures, options, or other derivatives.

(banking, finance) Interest, as on a loan or a bank account, that is calculated on the total on the principal plus accumulated unpaid interest.

One's personal interest or advantage, especially when pursued without regard for others.

(film, literature) One who is of interest as a (potential) partner in love. / A romantic relationship; a romance. / (film, literature) A romantic plot or subplot in a film or book.

Common good.

(banking, finance) The amount of interest that is allowed or required to be charged by law; an interest rate determined by law.