any real number that cannot be expressed as the ratio of two integers, such as π
WordReference Random House Unabridged Dictionary of American English © 2025
irra′tional num′ber, [Math.]
- Mathematicsa number that cannot be exactly expressed as a ratio of two integers.
- 1545–55
Collins Concise English Dictionary © HarperCollins Publishers::
'irrational number' also found in these entries (note: many are not synonyms or translations):