Any number of people can be reading from a given repository at a time.
noun An abstract entity used to describe quantity.
Zero, one, −1, 2.5, and pi are all numbers.
noun A numeral: a symbol for a non-negative integer.
The number 8 is usually made with a single stroke.
noun An element of one of several sets: natural numbers, integers, rational numbers, real numbers, complex numbers, and sometimes extensions such as hypercomplex numbers, etc.
The equation eiπ+1=0 includes the most important numbers: 1, 0, π, i, and e.
noun Indicating the position of something in a list or sequence. Abbreviations: No or No., no or no. (in each case, sometimes written with a superscript "o", like Nº or №). The symbol "#" is also used in this manner.
Horse number 5 won the race.
noun A sequence of digits and letters used to register people, automobiles, and various other items.
Her passport number is C01X864TN.
noun A telephone number.
Let's give her a call. Do you have her number handy?
noun Of a word or phrase, the state of being singular, dual or plural, shown by inflection.
Adjectives and nouns should agree in gender, number, and case.