A number used to denote quantity; a counting number; a cardinal.
A generalized kind of number used to denote the size of a set, including infinite sets.
A word that expresses a countable quantity; a cardinal numeral.
A number, assigned to something, such that it may be compared to others numerically
A measure of the energy released by an earthquake (e.g. on the Richter scale).
An order of magnitude.
The absolute or relative size, extent or importance of something.
Of a vector, the norm, most commonly, the two-norm.
The apparent brightness of a star, with lower magnitudes being brighter; apparent magnitude
A ratio of intensity expressed as a logarithm.