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irrational's - 1 dictionary results
ir·ra·tion·al     (ĭ-rāsh'ə-nəl)  Pronunciation Key 
adj.  
    1. Not endowed with reason.
    2. Affected by loss of usual or normal mental clarity; incoherent, as from shock.
    3. Marked by a lack of accord with reason or sound judgment: an irrational dislike.
    4. Being a syllable in Greek and Latin prosody whose length does not fit the metric pattern.
    5. Being a metric foot containing such a syllable.
    1. Being a syllable in Greek and Latin prosody whose length does not fit the metric pattern.
    2. 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.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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