NUMBER
Definition of NUMBER
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An abstract entity used to describe quantity.
"Zero, one, −1, 2.5, and pi are all numbers."
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A numeral: a symbol for a non-negative integer.
"The number 8 is usually made with a single stroke."
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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 e^{i\pi}+1=0 includes the most important numbers: 1, 0, \pi, i, and e."
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To label (items) with numbers; to assign numbers to (items).
"Number the baskets so that we can find them easily."
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To total or count; to amount to.
"I don’t know how many books are in the library, but they must number in the thousands."
Source: Wiktionary