Definitions
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adjective ((compar) more irrational, (superl) most irrational)
  1. Not rational; unfounded or nonsensical.
an irrational decision
  1. (mathematics) (no comparative or superlative) Of a real number, that cannot be written as the ratio of two integers.
The number π is irrational.
Etymology: From ancient Greececirca 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".
  • ir- + rational



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