noun /ˈkʍɑndədi,ˈkʍɑnɾəɾi,ˈkwɒn.tɪ.ti/
a) 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.
b) 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.
Wikipedia foundation.