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Wordnet 3.0

NOUN (2)

1. a quantity that does not vary;
[syn: constant, constant quantity, invariable]

2. a number representing a quantity assumed to have a fixed value in a specified mathematical context;
- Example: "the velocity of light is a constant"


ADJECTIVE (3)

1. unvarying in nature;
- Example: "maintained a constant temperature"
- Example: "principles of unvarying validity"
[syn: changeless, constant, invariant, unvarying]

2. steadfast in purpose or devotion or affection;
- Example: "a man constant in adherence to his ideals"
- Example: "a constant lover"
- Example: "constant as the northern star"

3. uninterrupted in time and indefinitely long continuing;
- Example: "the ceaseless thunder of surf"
- Example: "in constant pain"
- Example: "night and day we live with the incessant noise of the city"
- Example: "the never-ending search for happiness"
- Example: "the perpetual struggle to maintain standards in a democracy"
- Example: "man's unceasing warfare with drought and isolation"
- Example: "unremitting demands of hunger"
[syn: ceaseless, constant, incessant, never-ending, perpetual, unceasing, unremitting]


The Collaborative International Dictionary of English v.0.48:

Constant \Con"stant\ (k[o^]n"stant), 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.] [1913 Webster] If . . . you mix them, you may turn these two fluid liquors into a constant body. --Boyle. [1913 Webster] 2. Not liable, or given, to change; permanent; regular; continuous; continually recurring; steadfast; faithful; not fickle. Opposite of changeable and variable. [1913 Webster] Both loving one fair maid, they yet remained constant friends. --Sir P. Sidney. [1913 Webster] I am constant to my purposes. --Shak. [1913 Webster] His gifts, his constant courtship, nothing gained. --Dryden. [1913 Webster] Onward the constant current sweeps. --Longfellow. [1913 Webster] 3. (Math. & Physics) Remaining unchanged or invariable, as a quantity, force, law, etc. [1913 Webster] 4. Consistent; logical. [Obs.] --Shak. Syn: Fixed; steadfast; unchanging; permanent; unalterable; immutable; invariable; perpetual; continual; resolute; firm; unshaken; determined. Usage: 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. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Constant \Con"stant\, n. 1. That which is not subject to change; that which is invariable. [1913 Webster] 2. (Math.) A quantity that does not change its value; -- used in countradistinction to variable. [1913 Webster] 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. [Webster 1913 Suppl.] 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. [Webster 1913 Suppl.] 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. [PJC] 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[sec].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. [1913 Webster + Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):

constant adj 1: unvarying in nature; "maintained a constant temperature"; "principles of unvarying validity" [syn: changeless, constant, invariant, unvarying] 2: steadfast in purpose or devotion or affection; "a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star" [ant: inconstant] 3: uninterrupted in time and indefinitely long continuing; "the ceaseless thunder of surf"; "in constant pain"; "night and day we live with the incessant noise of the city"; "the never-ending search for happiness"; "the perpetual struggle to maintain standards in a democracy"; "man's unceasing warfare with drought and isolation"; "unremitting demands of hunger" [syn: ceaseless, constant, incessant, never- ending, perpetual, unceasing, unremitting] n 1: a quantity that does not vary [syn: constant, constant quantity, invariable] 2: a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant"
Moby Thesaurus II by Grady Ward, 1.0:

336 Moby Thesaurus words for "constant": abiding, accordant, active, age-long, aged, ageless, alike, ancient, antique, ardent, articulated, assiduous, atom, atomic mass, atomic number, atomic weight, automatic, balanced, beaten, catenated, ceaseless, changeless, chattering, chronic, clinging, close, coeternal, colorfast, committed, compliant, concatenated, confirmed, conforming, connected, conscientious, consistent, consonant, continual, continued, continuing, continuous, correspondent, cyclical, dateless, dedicated, deep-dyed, delicate, dependable, determined, devoted, devout, diligent, direct, diuturnal, dogged, double-dyed, durable, duteous, dutiful, dyed-in-the-wool, endless, enduring, equable, equal, eternal, eterne, even, ever-being, ever-durable, ever-during, evergreen, everlasting, everliving, exact, express, fadeless, faithful, fast, featureless, fine, firm, fixed, flat, flinty, frequent, frozen, gapless, habitual, hackneyed, hardy, homogeneous, immediate, immemorial, immobile, immovable, immutable, inalterable, incessant, incommutable, inconvertible, indefatigable, indefeasible, indelible, indestructible, indomitable, industrious, inerrable, inerrant, inert, infallible, infinite, inflexible, ingrain, ingrained, insistent, insusceptible of change, intact, interminable, intransient, intransmutable, invariable, inveterate, invincible, inviolate, irretrievable, irreversible, irrevocable, joined, jointless, lasting, level, liege, linked, long-lasting, long-lived, long-standing, long-term, longeval, longevous, loyal, machine gun, macrobiotic, marble-constant, mathematical, measured, mechanical, methodic, methodical, meticulous, micrometrically precise, microscopic, mindful, monolithic, monotonous, never-ceasing, never-ending, never-tiring, nice, noble, nonreturnable, nonreversible, nonstop, nonterminating, nonterminous, observant, obstinate, of a piece, of long duration, of long standing, olamic, ordered, orderly, oscillating, patient, patient as Job, perdurable, perduring, perennial, periodic, permanent, perpetual, perseverant, persevering, persistent, persisting, pertinacious, pinpoint, plodding, plugging, practicing, precise, preoccupied, pulsating, punctilious, punctual, quantum, quiescent, rapid, rapt, recurrent, recurring, refined, regardful, regular, regular as clockwork, relentless, religious, religiously exact, remaining, repeated, repetitive, resolute, reverseless, rigid, rigorous, robotlike, round-the-clock, routine, running, scientific, scientifically exact, scrupulous, seamless, sedulous, sempervirent, sempiternal, serried, set, settled, severe, single-minded, sleepless, slogging, smooth, solid, sot, square, stabile, stable, staccato, static, stationary, staunch, staying, steadfast, steady, steely, stereotyped, straight, strict, stubborn, stuttering, subtle, sustained, systematic, tenacious, tested, timeless, tireless, torpid, tough, tried, tried and true, trite, true, true-blue, trusty, twenty-four-hour, unabating, unalterable, unalterative, unaltered, unbending, unbroken, unceasing, unchangeable, unchanged, unchanging, unchecked, unconquerable, undaunted, undeflectable, undestroyed, undeviating, undifferentiated, undiscouraged, undiversified, undrooping, unending, unerring, unfading, unfailing, unfaltering, unflagging, unflappable, unflinching, uniform, unintermitted, unintermittent, unintermitting, uninterrupted, unmodifiable, unmovable, unnodding, unrelaxing, unrelenting, unrelieved, unremitting, unrestorable, unreturnable, unruffled, unshakable, unshakeable, unshaken, unshifting, unsleeping, unstopped, unsusceptible, unswerving, untiring, unvariable, unvaried, unvarying, unwavering, unwearied, unwearying, unwinking, unyielding, utterly attentive, valence, vibrating, vital, weariless, well-trodden, well-worn, without end