 # constant definition, constant meaning | English dictionary

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1    fixed and invariable; unchanging
2    continual or continuous; incessant
constant interruptions
3    resolute in mind, purpose, or affection; loyal
n
4    something that is permanent or unchanging
5    a specific quantity that is always invariable
the velocity of light is a constant
6
a      (Maths)   a symbol representing an unspecified number that remains invariable throughout a particular series of operations
b      (Physics)   a theoretical or experimental quantity or property that is considered invariable throughout a particular series of calculations or experiments
7       See       logical constant
(C14: from Old French, from Latin constans standing firm, from constare to be steadfast, from stare to stand)

n   the number of atoms or molecules in a mole of a substance, equal to 6.022 52x1023 per mole.,   (Symbol)    L, NA
Boltzmann constant
n     (Physics)   the ratio of the gas constant to the Avogadro constant, equal to 1.380622x10--23 joule per kelvin.,   (Symbol)    k
Constant     (French)
n   Benjamin (bɛ̃ʒamɛ̃). real name Henri Benjamin Constant de Rebecque. 1767--1830, French writer and politician: author of the psychological novel Adolphe (1816)
dielectric constant
n      another name for       relative permittivity
Dirac constant
n   a constant used in quantum mechanics equal to the Planck constant divided by 2π. It has a value of 1.0544±0.0003x10--34 joule seconds.,   (Symbol)    <dirac1>, <dirac2>  ,   (Also called)    crossed-h, h-bar
electric constant
n   the permittivity of free space, which has the value 8.854185x10--12 farad per metre.,   (Symbol)    εo  ,   (Also called)    absolute permittivity
fundamental constant
n   a physical constant, such as the gravitational constant or speed of light, that plays a fundamental role in physics and chemistry and usually has an accurately known value
gas constant
n   the constant in the gas equation. It is equal to 8.3143 joules per kelvin per mole.,   (Symbol)    R     (Also called)    universal gas constant
gravitational constant
n   the factor relating force to mass and distance in Newton's law of gravitation. It is a universal constant with the value 6.670x10--11 N m2 kg--2.,   (Symbol)    G
Hubble constant
n   the rate at which the universe expands, a value derived from the ratio of recession velocity to distance for galaxies beyond the Local Group. It is currently estimated to lie in the range 50--100 km s--1 megaparsec--1
logical constant
n   one of the connectives of a given system of formal logic, esp. those of the sentential calculus, not, and, or, and if ... then ...
magnetic constant
n   the permeability of free space, which has the value 4πx10--7henry per metre.,   (Symbol)    M0     (Also called)    absolute permeability
Planck constant   , Planck's constant
n   a fundamental constant equal to the energy of any quantum of radiation divided by its frequency. It has a value of 6.6262x10--34 joule seconds.,   (Symbol)    h      See also       Dirac constant
solar constant
n   the rate at which the sun's energy is received per unit area at the top of the earth's atmosphere when the sun is at its mean distance from the earth and atmospheric absorption has been corrected for. Its value is 1367 watts per square metre
time constant
n     (Electronics)   the time required for the current or voltage in a circuit to rise or fall exponentially through approximately 63 per cent of its amplitude
universal gas constant
n      another name for       gas constant Constant     (French)
n   Benjamin (bɛ̃ʒamɛ̃). real name Henri Benjamin Constant de Rebecque. 1767--1830, French writer and politician: author of the psychological novel Adolphe (1816)

n   the number of atoms or molecules in a mole of a substance, equal to 6.022 52x1023 per mole.,   (Symbol)    L, NA
Boltzmann constant
n     (Physics)   the ratio of the gas constant to the Avogadro constant, equal to 1.380622x10--23 joule per kelvin.,   (Symbol)    k
constant
1    fixed and invariable; unchanging
2    continual or continuous; incessant
constant interruptions
3    resolute in mind, purpose, or affection; loyal
n
4    something that is permanent or unchanging
5    a specific quantity that is always invariable
the velocity of light is a constant
6
a      (Maths)   a symbol representing an unspecified number that remains invariable throughout a particular series of operations
b      (Physics)   a theoretical or experimental quantity or property that is considered invariable throughout a particular series of calculations or experiments
7       See       logical constant
(C14: from Old French, from Latin constans standing firm, from constare to be steadfast, from stare to stand)
dielectric constant
n      another name for       relative permittivity
Dirac constant
n   a constant used in quantum mechanics equal to the Planck constant divided by 2π. It has a value of 1.0544±0.0003x10--34 joule seconds.,   (Symbol)    <dirac1>, <dirac2>  ,   (Also called)    crossed-h, h-bar
electric constant
n   the permittivity of free space, which has the value 8.854185x10--12 farad per metre.,   (Symbol)    εo  ,   (Also called)    absolute permittivity
fundamental constant
n   a physical constant, such as the gravitational constant or speed of light, that plays a fundamental role in physics and chemistry and usually has an accurately known value
gas constant
n   the constant in the gas equation. It is equal to 8.3143 joules per kelvin per mole.,   (Symbol)    R     (Also called)    universal gas constant
gravitational constant
n   the factor relating force to mass and distance in Newton's law of gravitation. It is a universal constant with the value 6.670x10--11 N m2 kg--2.,   (Symbol)    G
Hubble constant
n   the rate at which the universe expands, a value derived from the ratio of recession velocity to distance for galaxies beyond the Local Group. It is currently estimated to lie in the range 50--100 km s--1 megaparsec--1
logical constant
n   one of the connectives of a given system of formal logic, esp. those of the sentential calculus, not, and, or, and if ... then ...
magnetic constant
n   the permeability of free space, which has the value 4πx10--7henry per metre.,   (Symbol)    M0     (Also called)    absolute permeability
Planck constant   , Planck's constant
n   a fundamental constant equal to the energy of any quantum of radiation divided by its frequency. It has a value of 6.6262x10--34 joule seconds.,   (Symbol)    h      See also       Dirac constant
solar constant
n   the rate at which the sun's energy is received per unit area at the top of the earth's atmosphere when the sun is at its mean distance from the earth and atmospheric absorption has been corrected for. Its value is 1367 watts per square metre
time constant
n     (Electronics)   the time required for the current or voltage in a circuit to rise or fall exponentially through approximately 63 per cent of its amplitude
universal gas constant
n      another name for       gas constant diffusion coefficient   , constant
n   the rate at which a diffusing substance is transported between opposite faces of a unit cube of a system when there is unit concentration difference between them.,   (Symbol)    D     (Also called)    diffusivity

n   the number of atoms or molecules in a mole of a substance, equal to 6.022 52x1023 per mole.,   (Symbol)    L, NA
Boltzmann constant
n     (Physics)   the ratio of the gas constant to the Avogadro constant, equal to 1.380622x10--23 joule per kelvin.,   (Symbol)    k
constant
1    fixed and invariable; unchanging
2    continual or continuous; incessant
constant interruptions
3    resolute in mind, purpose, or affection; loyal
n
4    something that is permanent or unchanging
5    a specific quantity that is always invariable
the velocity of light is a constant
6
a      (Maths)   a symbol representing an unspecified number that remains invariable throughout a particular series of operations
b      (Physics)   a theoretical or experimental quantity or property that is considered invariable throughout a particular series of calculations or experiments
7       See       logical constant
(C14: from Old French, from Latin constans standing firm, from constare to be steadfast, from stare to stand)
Constant     (French)
n   Benjamin (bɛ̃ʒamɛ̃). real name Henri Benjamin Constant de Rebecque. 1767--1830, French writer and politician: author of the psychological novel Adolphe (1816)
dielectric constant
n      another name for       relative permittivity
Dirac constant
n   a constant used in quantum mechanics equal to the Planck constant divided by 2π. It has a value of 1.0544±0.0003x10--34 joule seconds.,   (Symbol)    <dirac1>, <dirac2>  ,   (Also called)    crossed-h, h-bar
electric constant
n   the permittivity of free space, which has the value 8.854185x10--12 farad per metre.,   (Symbol)    εo  ,   (Also called)    absolute permittivity
fundamental constant
n   a physical constant, such as the gravitational constant or speed of light, that plays a fundamental role in physics and chemistry and usually has an accurately known value
gas constant
n   the constant in the gas equation. It is equal to 8.3143 joules per kelvin per mole.,   (Symbol)    R     (Also called)    universal gas constant
gravitational constant
n   the factor relating force to mass and distance in Newton's law of gravitation. It is a universal constant with the value 6.670x10--11 N m2 kg--2.,   (Symbol)    G
Hubble constant
n   the rate at which the universe expands, a value derived from the ratio of recession velocity to distance for galaxies beyond the Local Group. It is currently estimated to lie in the range 50--100 km s--1 megaparsec--1
logical constant
n   one of the connectives of a given system of formal logic, esp. those of the sentential calculus, not, and, or, and if ... then ...
magnetic constant
n   the permeability of free space, which has the value 4πx10--7henry per metre.,   (Symbol)    M0     (Also called)    absolute permeability
Planck constant   , Planck's constant
n   a fundamental constant equal to the energy of any quantum of radiation divided by its frequency. It has a value of 6.6262x10--34 joule seconds.,   (Symbol)    h      See also       Dirac constant
solar constant
n   the rate at which the sun's energy is received per unit area at the top of the earth's atmosphere when the sun is at its mean distance from the earth and atmospheric absorption has been corrected for. Its value is 1367 watts per square metre
time constant
n     (Electronics)   the time required for the current or voltage in a circuit to rise or fall exponentially through approximately 63 per cent of its amplitude
universal gas constant
n      another name for       gas constant ## constant

1    continual, even, firm, fixed, habitual, immovable, immutable, invariable, permanent, perpetual, regular, stable, steadfast, steady, unalterable, unbroken, uniform, unvarying
2    ceaseless, continual, continuous, endless, eternal, everlasting, incessant, interminable, never-ending, nonstop, perpetual, persistent, relentless, sustained, uninterrupted, unrelenting, unremitting
3    determined, dogged, persevering, resolute, unflagging, unshaken, unwavering
4    attached, dependable, devoted, faithful, loyal, stalwart, staunch, tried-and-true, true, trustworthy, trusty, unfailing

Antonyms

1 & 2    changeable, changing, deviating, erratic, inconstant, intermittent, irregular, occasional, random, uneven, unstable, unsustained, variable
4    disloyal, fickle, irresolute, undependable