quantity

noun

• A fundamental, generic term used when referring to the measurement (count, amount) of a scalar, vector, number of items or to some other way of denominating the value of a collection or group of items.

  "You have to choose between quantity and quality."

• An indefinite amount of something.

  "Olive oil can be used practically in any quantity."

• A specific measured amount.

  "Generally it should not be used in a quantity larger than 15 percent."

• A considerable measure or amount.

  "The Boeing P-26A was the first all-metal monoplane fighter produced in quantity for the U.S. Army Air Corps."

• Property of a phenomenon, body, or substance, where the property has a magnitude that can be expressed as number and a reference.
• Indicates that the entire preceding expression is henceforth considered a single object.

  "x plus y quantity squared equals x squared plus 2xy plus y squared."