Definition of interest:
a sense of concern with and curiosity about someone or something; "an interest in music"
a reason for wanting something done; "for your sake"; "died for the sake of his country"; "in the interest of safety"; "in the common interest"
the power of attracting or holding one's attention (because it is unusual or exciting etc.); "they said nothing of great interest"; "primary colors can add interest to a room"
a fixed charge for borrowing money; usually a percentage of the amount borrowed; "how much interest do you pay on your mortgage?"
(law) a right or legal share of something; a financial involvement with something; "they have interests all over the world"; "a stake in the company's future"
(usually plural) a social group whose members control some field of activity and who have common aims; "the iron interests stepped up production"
a diversion that occupies one's time and thoughts (usually pleasantly); "sailing is her favorite pastime"; "his main pastime is gambling"; "he counts reading among his interests"; "they criticized the boy for his limited pursuits"
excite the curiosity of; engage the interest of
be on the mind of; "I worry about the second Germanic consonant shift"
be of importance or consequence; "This matters to me!"