Rational quantity
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, and mathematics . . . were but simple pastimes in comparison of the other. --Sir T. North. [1913 Webster]

2. Having reason, or the faculty of reasoning; endowed with reason or understanding; reasoning. [1913 Webster]

It is our glory and happiness to have a rational nature. --Law. [1913 Webster]

3. Agreeable to reason; not absurd, preposterous, extravagant, foolish, fanciful, or the like; wise; judicious; as, rational conduct; a rational man. [1913 Webster]

4. (Chem.) Expressing the type, structure, relations, and reactions of a compound; graphic; -- said of formul[ae]. See under {Formula}. [1913 Webster]

{Rational horizon}. (Astron.) See {Horizon}, 2 (b) .

{Rational quantity} (Alg.), one that can be expressed without the use of a radical sign, or in exact parts of unity; -- opposed to {irrational} or {radical quantity}.

{Rational symptom} (Med.), one elicited by the statements of the patient himself and not as the result of a physical examination. [1913 Webster]

Syn: Sane; sound; intelligent; reasonable; sensible; wise; discreet; judicious.

Usage: {Rational}, {reasonable}. Rational has reference to reason as a faculty of the mind, and is opposed to irrational; as, a rational being, a rational state of mind, rational views, etc. In these cases the speculative reason is more particularly, referred to. Reasonable has reference to the exercise of this faculty for practical purposes, and means, governed or directed by reason; as, reasonable desires or plans; a reasonable charge; a reasonable prospect of success. [1913 Webster]

What higher in her society thou find'st Attractive, human, rational, love still. --Milton. [1913 Webster]

A law may be reasonable in itself, although a man does not allow it, or does not know the reason of the lawgivers. --Swift. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • rational quantity — racionalusis dydis statusas T sritis fizika atitikmenys: angl. rational quantity vok. rationale Größe, f rus. рациональная величина, f pranc. grandeur rationnelle, f …   Fizikos terminų žodynas

  • non-rational quantity — iracionalusis dydis statusas T sritis fizika atitikmenys: angl. irrational quantity; non rational quantity vok. irrationale Größe, f; nichtrationale Größe, f rus. иррациональная величина, f; нерациональная величина, f pranc. grandeur… …   Fizikos terminų žodynas

  • 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 horizon — 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 …   The Collaborative International Dictionary of English

  • Rational symptom — 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 …   The Collaborative International Dictionary of English

  • Rational Emotive Behavior Therapy — (REBT) is a comprehensive, active directive, philosophically and empirically based psychotherapy which focuses on resolving emotional and behavioral problems and disturbances and enabling people to lead happier and more fulfilling lives. REBT was …   Wikipedia

  • Rational trigonometry — is a recently introduced approach to trigonometry that eschews all transcendental functions (such as sine and cosine) and all proportional measurements of angles. In place of angles, it characterizes the separation between lines by a quantity… …   Wikipedia

  • rational — [rash′ən əl] adj. [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;… …   English World dictionary

  • rational — ► ADJECTIVE 1) based on or in accordance with reason or logic. 2) able to think sensibly or logically. 3) having the capacity to reason. 4) Mathematics (of a number or quantity) expressible as a ratio of whole numbers. DERIVATIVES rationality… …   English terms dictionary

  • Rational Decision-Making Model — The Rational Decision Making Model is a process for making logically sound decisions. [Robbins, Stephen P., and Timothy A. Judge. Organization Behavior. 12th ed. Upper Saddle River, New Jersey: Pearson Prentice Hall, 2007. 156 158.] The model… …   Wikipedia

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