ir·ra·tion·al ( -r sh  -nl)adj. 1. a. Not endowed with reason. b. Affected by loss of usual or normal mental clarity; incoherent, as from shock. c. Marked by a lack of accord with reason or sound judgment: an irrational dislike. 2. a. Being a syllable in Greek and Latin prosody whose length does not fit the metric pattern. b. Being a metric foot containing such a syllable. 3. Mathematics Of or relating to an irrational number. n. Mathematics An irrational number. ir·ra tion·al·ly adv.ir·ra tion·al·ness n. |
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