an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification.
she dialed the number carefully
a quantity or amount.
the company is seeking to increase the number of women on its staff
a single issue of a magazine.
the October number of “Travel.”
a distinction of word form denoting reference to one person or thing or to more than one.
Countable nouns make a distinction between singular and plural number .