(chemistry, physics) the progressive decrease in the radii of atoms of the lanthanide elements as the atomic number increases; evident in various physical properties of the elements and their compounds

(law) An agreement in which an offeror's offer can be accepted only by the performance of an act by the offeree; a "promise for a performance".

A card game in which four players, forming two partnerships, first bid then play by taking tricks.

(anatomy) The tensioning of a muscle as it is being lengthened

(linguistics) An etymological phenomenon when a new word or slang term develops from shortening and slightly altering a longer word.

A person who contracts to kill a specified person for an agreed sum of money.

A contract entered into directly between the client and contractor (contracted provider of products or services.) Used especially of contracts involving government agencies or bodies, or entities such as educational institutions.

(law, banking) A contractual agreement governing the handling of deposited assets, for example in a bank.

(law) An agreement in which in which one party agrees to supply as much of a good or service as is required by the other party, and in exchange the other party expressly or implicitly promises that it will obtain its goods or services exclusively from the first party.

(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.