Dictionary > English Dictionary > Definition, synonym and antonym of constant

Explanation of constant by Wordnet Dictionary


    1. steadfast in purpose or devotion or affection

    2. a man constant in adherence to his ideals
      a constant lover
      constant as the northern star
    3. uninterrupted in time and indefinitely long continuing

    4. in constant pain
    5. unvarying in nature

    6. maintained a constant temperature
    1. a quantity that does not vary

    2. a number representing a quantity assumed to have a fixed value in a specified mathematical context

    3. the velocity of light is a constant

    Definition of constant by GCIDE Dictionary


    1. Constant ( kŏnstant ), a. [L. onstans, -antis, p. pr. of constare to stand firm, to be consistent; con- + stare to stand: cf. F. constant. See Stand and cf. Cost, v. t.]
      1. Firm; solid; fixed; immovable; -- opposed to fluid. [Obs.]

      If . . . you mix them, you may turn these two fluid liquors into a constant body. Boyle.

      2. Not liable, or given, to change; permanent; regular; continuous; continually recurring; steadfast; faithful; not fickle. Opposite of changeable and variable.

      Both loving one fair maid, they yet remained constant friends. Sir P. Sidney.

      I am constant to my purposes. Shak.

      His gifts, his constant courtship, nothing gained. Dryden.

      Onward the constant current sweeps. Longfellow.

      3. ( Math. & Physics ) Remaining unchanged or invariable, as a quantity, force, law, etc.

      4. Consistent; logical. [Obs.] Shak.

      Syn. -- Fixed; steadfast; unchanging; permanent; unalterable; immutable; invariable; perpetual; continual; resolute; firm; unshaken; determined. -- Constant, Continual, Perpetual. These words are sometimes used in an absolute and sometimes in a qualified sense. Constant denotes, in its absolute sense, unchangeably fixed; as, a constant mind or purpose. In its qualified sense, it marks something as a “standing” fact or occurence; as, liable to constant interruptions; constantly called for. Continual, in its absolute sense, coincides with continuous. See Continuous. In its qualified sense, it describes a thing as occuring in steady and rapid succession; as, a round of continual calls; continually changing. Perpetual denotes, in its absolute sense, what literally never ceases or comes to an end; as, perpetual motion. In its qualified sense, it is used hyperbolically, and denotes that which rarely ceases; as, perpetual disturbance; perpetual noise; perpetual intermeddling.

    2. Constant, n.
      1. That which is not subject to change; that which is invariable.

      2. ( Math. ) A quantity that does not change its value; -- used in countradistinction to variable.

      3. ( Astron. ) A number whose value, when ascertained ( as by observation ) and substituted in a general mathematical formula expressing an astronomical law, completely determines that law and enables predictions to be made of its effect in particular cases.

      4. ( Physics ) A number expressing some property or condition of a substance or of an instrument of precision; as, “the dielectric constant of quartz; the collimation constant of a transit instrument”.

      5. ( Computers ) a data structure that does not change during the course of execution of a program. It may be a number, a string, or a more complex data structure; -- contrasted with variable.

      Aberration constant, or Constant of aberration ( Astron. ), a number which by substitution in the general formula for aberration enables a prediction to be made of the effect of aberration on a star anywhere situated. Its value is 20˝.47. -- Absolute constant ( Math. ), one whose value is absolutely the same under all circumstances, as the number 10, or any numeral. -- Arbitrary constant, an undetermined constant in a differential equation having the same value during all changes in the values of the variables. -- Gravitation constant ( Physics ), the acceleration per unit of time produced by the attraction of a unit of mass at unit distance. When this is known the acceleration produced at any distance can be calculated. -- Solar constant ( Astron. ), the quantity of heat received by the earth from the sun in a unit of time. It is, on the C. G. S. system, 0.0417 small calories per square centimeter per second. Young. [Webster 1913 Suppl.] -- Constant of integration ( Math. ), an undetermined constant added to every result of integration.