Meaning of rational by Wiktionary Dictionary
Explanation of rational by Wordnet Dictionary
rational
 rationall ( obsolete )
 enPR: ră'sh( ə )nəl, IPA: /ˈræʃ( ə )nəl/, XSAMPA: /"r{S( @ )n@l/
 Capable of reasoning.
 2001, Mark Sainsbury, chapter 1, Logical Forms — An Introduction to Philosophical Logic, edition 2nd, Blackwell Publishing, ISBN 9780631216797, §7, page 32:
 How could a valid argument ever be persuasive? It is possible because we do not always acknowledge or take explicit note of all the logical consequences of our beliefs. If we did explicitly hold before our minds all the logical consequences of our beliefs, seeing them as consequences, we would already have accepted the conclusion of any valid argument whose premises we have accepted. Hence no valid argument could be persuasive. This is how things would be with a perfectly rational being. The utility of valid arguments is a monument to our frailty: to the fact that we are not completely rational beings .
 2001, Mark Sainsbury, chapter 1, Logical Forms — An Introduction to Philosophical Logic, edition 2nd, Blackwell Publishing, ISBN 9780631216797, §7, page 32:
 Logically sound; not contradictory or otherwise absurd .
 His statements were quite rational .
 ( of a person or personal characteristics ) Healthy or balanced intellectually; exhibiting reasonableness .
 ( mathematics, arithmetic, number theory, not comparable ) Of a number, capable of being expressed as the ratio of two integers .
 ( mathematics, arithmetic, not comparable ) Of an algebraic expression, capable of being expressed as the ratio of two polynomials .
 ( reasonable ): absurd, irrational, nonsensical
 ( capable of reasoning ): arational, irrational, nonrational
 ( number theory ): irrational
Alternative forms
Pronunciation
Etymology 1
From Old French rationel, rational, from Latin rationalis ( “of or belonging to reason, rational, reasonable” ), from ratio ( “reason” )
Adjective
rational ( comparative more rational, superlative most rational )
Antonyms
Related terms
Etymology 2
From Old French rational, from Medieval Latin rationale ( “a pontifical stole, a pallium, an ornament worn over the chasuble” ), neuter of Latin rationalis ( “rational” ), for which see the first etymology .
Noun
See also
Anagrams
Explanation of rational by Wordnet Dictionary
rational

having its source in or being guided by the intellect ( as distinguished from experience or emotion )
 a rational analysis

consistent with or based on or using reason
 rational numbers
Adjective
Noun