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rational

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.28 sec.
ra·tion·al  (rsh-nl)
adj.
1. Having or exercising the ability to reason.
2. Of sound mind; sane.
3. Consistent with or based on reason; logical: rational behavior. See Synonyms at logical.
4. Mathematics Capable of being expressed as a quotient of integers.
n. Mathematics
A rational number.

[Middle English racional, from Old French racionel, from Latin ratinlis, from rati, ratin-, reason; see reason.]

ration·al·ly adv.
ration·al·ness n.

rational
Adjective
1. reasonable or sensible
2. using reason or logic in thinking out a problem
3. capable of reasoning: man is a rational being
4. sane: rational behaviour
5. Maths able to be expressed as a ratio of two integers: a rational number [Latin rationalis]
rationality n
rationally adv
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.rational - an integer or a fraction
real, real number - any rational or irrational number
fraction - the quotient of two rational numbers
Adj.1.rational - consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought"
logical - capable of or reflecting the capability for correct and valid reasoning; "a logical mind"
reasonable, sensible - showing reason or sound judgment; "a sensible choice"; "a sensible person"
sane - mentally healthy; free from mental disorder; "appears to be completely sane"
irrational - not consistent with or using reason; "irrational fears"; "irrational animals"
2.rational - of or associated with or requiring the use of the mind; "intellectual problems"; "the triumph of the rational over the animal side of man"
mental - involving the mind or an intellectual process; "mental images of happy times"; "mental calculations"; "in a terrible mental state"; "mental suffering"; "free from mental defects"
3.rational - capable of being expressed as a quotient of integers; "rational numbers"
math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
irrational - real but not expressible as the quotient of two integers; "irrational numbers"
4.rational - having its source in or being guided by the intellect (as distinguished from experience or emotion); "a rational analysis"
intellectual - appealing to or using the intellect; "satire is an intellectual weapon"; "intellectual workers engaged in creative literary or artistic or scientific labor"; "has tremendous intellectual sympathy for oppressed people"; "coldly intellectual"; "sort of the intellectual type"; "intellectual literature"

rational
adjective 3. sane, balanced, normal, all there (informal) lucid, of sound mind, compos mentis (Latin) in your right mind << OPPOSITE insane
Translations
Spanish rational [ˈræʃənl] adjracional; [solution, reasoning] → lógico, razonable; [person] → cuerdo, sensato
French rational [ˈræʃənl] adjraisonnable, sensé(e); [solution, reasoning] → logique;
(Med) [person] → lucide

German rational [ˈræʃənl] adjrational, vernünftig
Italian rational [ˈræʃənl] adjrazionale, ragionevole; [solution, reasoning] → logico/a

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To Bolkonski so many people appeared contemptible and insignificant creatures, and he so longed to find in someone the living ideal of that perfection toward which he strove, that he readily believed that in Speranski he had found this ideal of a perfectly rational and virtuous man.
I am bewildered in my endeavours to form some rational conjecture of what Mrs.
Steadily as she persisted in taking the rational view, nevertheless the writing frightened her.
 
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