means a feeling of curiosity or attention toward something, or the money paid for the use of borrowed funds (or earned on savings).

from From Latin 'interesse,' literally 'to be between' (inter 'between' + esse 'to be') — the sense of something that 'concerns' you, that lies between you and a matter. In medieval Latin the noun 'interesse' came to mean compensation for loss or damage, a legal term for what was owed; this slid into the financial sense of a charge for the use of money. The 'curiosity' meaning grew from the older idea of having a personal stake or concern in something. English took it through Old French in the 15th century.