legal Definition of unjust enrichment
1
:the retaining of a benefit (as money) conferred by another when principles of equity and justice call for restitution to the other party;
also
:the retaining of property acquired especially by fraud from another in circumstances that demand the judicial imposition of a constructive trust on behalf of those who in equity ought to receive it — see also quasi contract 1 at contract
2
:a doctrine that requires an equitable remedy on behalf of one who has been injured by the unjust enrichment of another
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