A mechanism in a diving regulator which controls the supply of gas by opening to provide flow when the user inhales, and shuts off supply when inhalation stops.

plural of demand characteristic

(usually in the plural) An aspect of an experimental design that leads subjects to infer, and comply with, researcher expectations, thereby confounding the experimental results.

A telecheck.

plural of demand deposit

(banking) A bank deposit that may be withdrawn without notice.

(economics) A graph depicting the relationship between the price of a certain commodity and the amount of it that consumers are willing and able to purchase at that given price.

(marketing) A business that generates demand for another business's advertisement inventory.

plural of demand partner

(economics) A permanent or sustained decline in the demand for a good in response to persistent high prices or limited supply.