rational [rash′ən əl]
[ME racional < L rationalis < ratio: see REASON]
1. of, based on, or derived from reasoning [rational powers]
2. able to reason; reasoning; in possession of one's reason or sanity
3. showing reason; not foolish or silly; sensible [a rational argument]
4. Math.
a) designating or of a real number or quantity expressible as the ratio of two integers, with the second integer not being equal to zero: all integers and fractions are rational numbers: cf. IRRATIONAL, sense 3
b) designating a function expressible as the quotient of two polynomials
SYN.- RATIONAL implies the ability to reason logically, as by drawing conclusions from inferences, and often connotes the absence of emotionalism [man is a rational creature ]; REASONABLE is a less technical term and suggests the use of practical reason in making decisions, choices, etc. [a reasonable solution to a problem ]; SENSIBLE, also a nontechnical term, implies the use of common sense or sound judgment [you made a sensible decision ] -ANT. IRRATIONAL, ABSURD

English World dictionary. . 2014.

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  • Rational — Ra tion*al (r[a^]sh [u^]n*al), a. [L. rationalis: cf. F. rationnel. See {Ratio}, {Reason}, and cf. {Rationale}.] 1. Relating to the reason; not physical; mental. [1913 Webster] Moral philosophy was his chiefest end; for the rational, the natural …   The Collaborative International Dictionary of English

  • rational — rational, aux [ rasjɔnal, o ] n. m. • racionale XIIIe; lat. rationale ♦ Didact. 1 ♦ Antiq. Pièce d étoffe ornée de pierreries que le grand prêtre des Hébreux portait sur la poitrine. ⇒ pectoral. 2 ♦ (a. fr. livre rational « livre de raison »; lat …   Encyclopédie Universelle

  • Rational AG — Rechtsform Aktiengesellschaft ISIN DE0007010803 Gründung …   Deutsch Wikipedia

  • raţional — RAŢIONÁL, Ă, raţionali, e, adj. 1. (Adesea adverbial) Conform cu principiile şi cerinţele raţiunii; care poate fi conceput cu ajutorul raţiunii. ♦ (În filozofia raţionalistă) Izvorât sau dedus din raţiune, considerat ca independent de experienţă… …   Dicționar Român

  • rational — rational, reasonable may be applied to men, their acts, utterances, or policies in the senses of having or manifesting the power to reason, or of being in accordance with what reason dictates as right, wise, or sensible. Rational usually implies… …   New Dictionary of Synonyms

  • Rational — may refer to: * Rationality, a concept of reason * Rational number, a number that can be expressed as a ratio of two integers * Rational function, a mathematical function which can be written as the ratio of two polynomial functions * Rational… …   Wikipedia

  • Rational — steht für: das vernunftbegabte und somit rationale Handeln, siehe Rationalität Rational AG, größter Hersteller von Heißluftdämpfern Rational (Heatley Gresham), eine Automobilmarke Rational Software, ehemaliges Softwareunternehmen inzwischen von… …   Deutsch Wikipedia

  • rational — ra·tio·nal / ra shə nəl/ adj 1: having reason or understanding 2: relating to, based on, or guided by reason, principle, fairness, logic, a legitimate state interest, or a consideration of fact age distinctions are not subject to strict scrutiny …   Law dictionary

  • Rational — (v. lat.), 1) vernünftig; 2) (Rationell), vernunftgemäß, auf Ergebnisse eigner Prüfung u. vernünftigen Gründen beruhend, daher theils dem positiven, theils dem blos empirischen u. praktischen entgegengesetzt, s. u. Rationalismus 1); 3) rational… …   Pierer's Universal-Lexikon

  • Rational — Ra tion*al, n. A rational being. Young. [1913 Webster] …   The Collaborative International Dictionary of English

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