# NUMBER

## Meaning of NUMBER in English

I

Basic element of mathematics used for counting, measuring, solving equations, and comparing quantities.

They fall into several categories. The counting numbers are the familiar 1, 2, 3 . . . ; whole numbers are the counting numbers and zero ; rational numbers are all possible quotients formed by integers, including fractions . These numbers can be symbolically represented by terminating or repeating decimals. Irrational numbers cannot be represented by fractions of integers or repeating decimals and must be represented by special symbols such as 2, e , and π. Together, the rational and irrational numbers constitute the real numbers , which form an algebraic field (see field theory ), as do the complex numbers . While the counting numbers and rational numbers come about as the means of counting, calculating, and measuring, the others arose as means of solving equations. See also transcendental number .

II

[c mediumvioletred] (as used in expressions)

atomic number

complex number

imaginary number

International Standard Book Number

number system

number theory

prime number

rational number

real number

Reynolds number

transcendental number

Britannica English dictionary.      Английский словарь Британика.