Definition of vested interest
1
: an interest (such as a title to an estate) carrying a legal right of present or future enjoyment
specifically
: a right vested in an employee under a pension plan
2
: a special concern or stake in maintaining or influencing a condition, arrangement, or action especially for selfish ends
3
: one having a vested interest in something
specifically
: a group enjoying benefits from an existing economic or political privilege
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Merriam-Webster unabridged
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Time Traveler for vested interest
The first known use of vested interest was in 1818
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