FEELING [U, no plural] › the feeling of wanting to give attention to something or discover more about it: Mark had an interest in the media and wanted to become a journalist. After a while he simply lost interest in (= stopped being interested) his studies. Bindi felt that her father didn't take much of an interest in her (= he was not very interested). ACTIVITY/SUBJECT [C] › something you enjoy doing, studying, or experiencing: We share a lot of the same interests, particularly music and football. MONEY YOU PAY [U] › the extra money that you must pay to a bank, company, etc which has lent you money: low interest rates MONEY YOU EARN [U] › the money you earn from keeping your money in a bank account QUALITY [U] › a quality that makes you think something is interesting: Would this book be of any interest to you? The tour offers a chance to visit places of interest. ADVANTAGE [C, U] › something that gives someone or something an advantage: A union looks after the interests of its members.
be in sb's interest(s) › to help someone and give them an advantage: It may not be in your interests to change jobs so soon.
in the interest(s) of sth › in order to achieve a particular situation or quality: In the interest of safety, passengers are advised to wear their seat belts at all times.