magnitude

Greatness of rank or position.

Greatness in size or extent.

Greatness in significance or influence.

The brightness of a celestial body on a numerical scale for which brighter objects have smaller values. Differences in magnitude are based on a logarithmic scale that matches the response of the human eye to differences in brightness so that a decrease of one magnitude represents an increase in apparent brightness by a factor of 2.512.

A unit on such a scale of brightness.

A number assigned to a quantity so that it may be compared with other quantities.

A property that can be described by a real number, such as the volume of a sphere or the length of a vector.