Related: agree, bind together, charter, constrict, private law A contract is an legal agreement such as a license, lease, agreement, treaty. /*Contract \Con"tract\, n. [L. contractus, fr. contrahere: cf. F. contrat, formerly also contract.] 1. (Law) The agreement of two or more persons, upon a sufficient consideration or cause, to do, or to abstain from doing, some act; an agreement in which a party undertakes to do, or not to do, a particular thing; a formal bargain; a compact; an interchange of legal rights. --Wharton.*/ The GNU General Public Law is a contract between two or more persons.