real number

Noun

Singular real number

Plural real numbers

1. (countable) (mathematics) The set of numbers that includes the integers, the rational numbers and the irrational numbers. In a set-theoretic sense, they are uncountable.
   • Antonym: imaginary number

   All numbers between ${\displaystyle -\infty }$ and ${\displaystyle \infty }$ are real numbers.