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definition of the word irrational

by the Wiktionnary

From ancient Greece circa 500 B.C. "Irrational" originally meant only that a number could not be expressed as a ratio. But for the pythagoreans it came to mean something threatening, a hint that their world view might not make sense, which is today the other meaning of "irrational".

irrational (comparative more irrational, superlative most irrational)

Positive
irrational

Comparative
more irrational

Superlative
most irrational

  1. Not rational; unfounded or nonsensical.
    an irrational decision
  2. (mathematics) (no comparative or superlative) Of a real number, that cannot be written as the ratio of two integers.
    The number π is irrational.


Definition from Wiktionary
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