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› a strong reason for supporting a particular action which will give you a personal or financial advantage:a vested interest in sth Leaks about a possible merger were traced back to the companies with a vested interest in the deal.The majority faction has a vested interest in taking part in the election.
vested interests [plural] disapproving
› people or organizations with a financial or personal advantage in a system, situation, etc., used especially when they refuse to allow changes to it that would cause them to lose this advantage:The bond market and other vested interests fought plans to tighten the tax loopholes.Strong vested interests can keep a counter-productive policy going almost indefinitely.
(Definition of vested interest noun from the Cambridge Business English Dictionary © Cambridge University Press)
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