1. vested interest (in something) a personal reason for wanting something to happen, especially because you get some advantage from it
   • ● They have a vested interest in keeping the club as exclusive as possible.
   • ● Vested interests (= people with a vested interest) are opposing the plan.
   • ● She thinks that lawyers have a vested interest in making the legal process move slowly.
   • ● Protectionism often simply supports narrow vested interests.

[TahlilGaran] English Dictionary ▲