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English Dictionary - With Multi-Lingual Search Definitions irrational adjective ((compar) more irrational, (superl) most irrational) Not rational; unfounded or nonsensical. an irrational decision (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      Full Definition of irrational  Find:   Words Starting With:   Words Ending With:   Words Containing:   Words That Match:    Translate Into:    Dutch   French   German    Italian   Spanish     Show 51015202550 results per page. Enter your search terms Submit search form   Web www.allwords.com Browse the Dictionary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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