(law) A category of contract used in labor law to attribute right and responsibilities between parties to a bargain.

(finance) A standardized contract, traded on a futures exchange, to buy or sell a standardized quantity of a specified commodity (or financial instrument) of standardized quality at a certain date in the future, at a stated price (the futures price).

(law) A contract that involves an exchange of goods, services or property to be exchanged from seller (or vendor) to buyer (or purchaser) for an agreed upon value in money (or money equivalent) paid or the promise to pay same.

The right of individuals to bargain freely among themselves the terms of their own contracts, without government interference.

(law) A failure to meet an obligation under the terms of a contract.

(law) An obligation created by the law in the absence of an agreement or contract; not based upon the intentions or expressions of the parties.

(law) The area of law pertaining to the rights and duties that arise from agreements.

(technology, cryptocurrencies) A software protocol that is capable of automatically enforcing terms agreed upon in a contract.

(philosophy, politics) An implicit agreement or contract among members of a society governing such matters as submission of individuals to rule of law and acceptable conduct.

(software, design) A software design approach that prescribes that software designers should define formal, precise and verifiable interface specifications ("contracts") for software components that extend the ordinary definition of abstract data types with preconditions, postconditions and invariants.