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constant    音標拼音: [k'ɑnstənt]
n. 常數,恒量
a. 不變的,一定的,時常的

常數,恆量不變的,一定的,時常的

constant
常數

constant
常數

constant
adj 1: unvarying in nature; "maintained a constant temperature";
"principles of unvarying validity" [synonym: {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" [synonym: {ceaseless}, {constant}, {incessant}, {never-
ending}, {perpetual}, {unceasing}, {unremitting}]
n 1: a quantity that does not vary [synonym: {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"

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]


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.]

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

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