Quantity

Note: This is with a relaxed middle T, and should be considered colloquial pronunciation.

From Latin quantitas ("quantity"), from quantus ("how much").

Full definition of quantity

(plural quantities)

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.Some soap making oils are best as base oils, used in a larger quantity in the soap, while other oils are best added in a small quantity.Olive oil can be used practically in any quantity.
A specific measured amount.This bag would normally costs $497.50 for a quantity of 250, at a price of $1.99 per piece.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.
(metrology) Property of a phenomenon, body, or substance, where the property has a magnitude that can be expressed as number and a reference.
(mathematics) 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.

In mathematics, used to unambiguously orate mathematical equations; it is extremely rare in print, since there is no need for it there.