# Dictionary Definition

rational adj

1 consistent with or based on or using reason;
"rational behavior"; "a process of rational inference"; "rational
thought" [ant: irrational]

2 of or associated with or requiring the use of
the mind; "intellectual problems"; "the triumph of the rational
over the animal side of man" [syn: intellectual, noetic]

3 capable of being expressed as a quotient of
integers; "rational numbers" [ant: irrational]

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

# User Contributed Dictionary

## English

### Pronunciation

- ră'sh(ə)nəl, /ˈræʃ(ə)nəl/, /"r

# Extensive Definition

Rational may be:

- pertaining to rationality
- acting according to the philosophical principles of rationalism
- a mathematical term for certain numbers; the rational numbers
- A rational function, a mathematical function which can be written as the ratio of two polynomial functions.
- the software company Rational Software; now owned by IBM, and formerly Rational Software Corporation
- the most central paradigm of Rational-Emotive Therapy
- Rational, one of the four temperaments according to the Keirsey Temperament Sorter.
- A common misspelling of "rationale".

rational in German: Rational

rational in French: Rationnel

# Synonyms, Antonyms and Related Words

acceptable, admissible, algorismic, algorithmic, aliquot, all there, analytic, balanced, bright, calm, cardinal, cerebral, circumspect, clear-eyed,
clearheaded,
clearminded,
cogent, commonsense, compos mentis,
conceptive, conceptual, consequent, cool, coolheaded, credible, decimal, differential, digital, discriminating, discursive, down-to-earth,
earthy, endopsychic, enlightened, even, everyday, exponential, figural, figurate, figurative, finite, fractional, hardheaded, healthy-minded,
ideational, imaginary, impair, impossible, infinite, informed, integral, intellectual, intelligent, internal, irrational, judicious, just, justifiable, knowing, knowledgeable, legitimate, level-headed,
levelheaded,
logarithmic,
logical, logometric, lucid, matter-of-fact, mental, mentally sound, negative, noetic, noological, normal, not so dumb, numeral, numerary, numerative, numeric, odd, of sound mind, ordinal, pair, philosophical, phrenic, plausible, positive, positivistic, possible, practical, practical-minded,
pragmatic, prime, prudent, psychic, psychologic, radical, ratiocinative, ratiocinatory, real, realist, realistic, reasonable, reasoning, reciprocal, right, sane, sane-minded, scientific, scientistic, secular, sensible, sober, sober-minded, sophic, sound, sound-minded,
sound-thinking, spiritual, stable, straight-thinking,
strong-minded, subjective, submultiple, surd, thinking, together, transcendental, understanding, unideal, unidealistic, unromantic, unsentimental,
well-argued, well-balanced, well-founded, well-grounded, wholesome, wise, worldly