unjust enrichment
C1CEFR level
75/100Rarity: rare
TechnicalRegister
The receipt of a benefit at another's expense in circumstances the law treats as unjust, grounding a duty to make restitution.
His retention of the overpayment is textbook unjust enrichment; there was simply no basis for it.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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