Meaning & use
rational number
A number that can be written as a fraction of two integers, with a nonzero denominator.
See it in a sentence
Three-quarters is a rational number because it can be written as the fraction three over four.
Unlike pi, most rational numbers can be expressed exactly as a simple fraction or decimal.
A note on using this word
Every integer is also a rational number, since it can be written as itself divided by one; numbers like pi are not rational.
Words with a similar meaning
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