All quantities here and below are defined in the Methods section.

Related quantities are defined in terms of the survival function.

The quantity is defined in two different ways, depending on the context:

Note that the quantity of the "product" is typically defined ignoring external costs and benefits.

These quantities are defined in the article on Onsager reciprocal relations.

In statistics, the term precision can mean a quantity defined in a specific way.

The quantity of ingredients is never exactly defined.

These may be abstract quantities defined for the sport, or more natural measures such as a distance or duration.

Parachor is a scientific quantity defined according to the formula:

In this stream of thinking, quantity of heat is defined primarily through calorimetry.