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English definition of “vested interest”

vested interest

noun [C]  /ˈves·tɪd ˈɪn·trəst, ˈɪn·tər·əst/
an interest in influencing something so that you can continue to benefit from it: She said the port has a vested interest in protecting the community's environment. A vested interest is also a person or group who has this type of relationship with something: The British vested interests didn't regulate their own industries, as the Chinese state firms do.
(Definition of vested interest noun from the Cambridge Academic Content Dictionary © Cambridge University Press)

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