unjust enrichment defined, property law definitions, real property words and phrases. from an implied condition which the law implies, or reads into a contract, About Implied in Law Contracts. When the court is required to uphold justice, the law may call for the formation of an implied in law contract. For example, if one person benefits from another person without legal entitlement, this is called unjust enrichment. The law will require the enriched party to make restitution to the other party even if no oral or written contract to that effect exists. Definition. An obligation imposed by law to prevent unjust enrichment . Also called a contract implied in law or a constructive contract, a quasi contract may be presumed by a court in the absence of a true contract, but not where a contract—either express or implied in fact —covering the same subject matter already exists. Because