Latin for "as much as he has deserved." An equitable remedy that provides restitution for unjust enrichment. Damages awarded in an amount considered reasonable to compensate a person who has provided services in a quasi-contractual relationship. See Quasi contract (or quasi-contract).
A claim in quantum meruit is usually an action to recover the reasonable value of services rendered by one party to another.
See, e.g. Foman v. Davis, 371 U.S. 178 (1962).