Meaning of constant

constant




Think of something or someone that does not change as constant. A classmate’s constant drumming on the table with his fingers could be a constant source of annoyance.

Constant derives from Latin verb meaning “to stand with,” so something constant is continually standing with you and not wavering. You may be thankful for the constant companionship of your dog but not necessarily for your teacher’s constant homework assignments. In math and science, a constant is a number that is fixed and known, unlike a variable which changes with the context. That idea crosses over to real life. If a friend is a constant in your life, that means they have always been with you and there for you.

Definitions of constant
  1. adjective

    uninterrupted in time and indefinitely long continuing

    “in
    constant pain”
    synonyms:

    ceaseless, incessant, never-ending, perpetual, unceasing, unremitting

    continuous, uninterrupted

    continuing in time or space without interruption
  2. adjective

    unvarying in nature

    “maintained a
    constant temperature”
    synonyms:

    changeless, invariant, unvarying

    invariable

    not liable to or capable of change
  3. adjective

    steadfast in purpose or devotion or affection

    “a man
    constant in adherence to his ideals”
    “a
    constant lover”
    constant as the northern star”
    Synonyms:

    unchangeable

    not changeable or subject to change
    staunch, steadfast, unswerving

    firm and dependable especially in loyalty
    unfailing, unflagging

    unceasing
    faithful

    steadfast in affection or allegiance
    stable

    resistant to change of position or condition
    invariable

    not liable to or capable of change
    see moresee less

    Antonyms:

    inconstant

    likely to change frequently often without apparent or cogent reason; variable
    changeable, changeful

    such that alteration is possible; having a marked tendency to change
    false, untrue

    (used especially of persons) not dependable in devotion or affection; unfaithful
    fickle, volatile

    marked by erratic changeableness in affections or attachments
    unfaithful

    not true to duty or obligation or promises
    unstable

    lacking stability or fixity or firmness
    variable

    liable to or capable of change
    volatile

    evaporating readily at normal temperatures and pressures
    show more antonyms…

  4. noun

    a quantity that does not vary

    synonyms:

    constant quantity, invariable

    see moresee less

    types:

    parameter, parametric quantity

    a constant in the equation of a curve that can be varied to yield a family of similar curves
    degree of freedom

    one of the minimum number of parameters needed to describe the state of a physical system
    type of:

    quantity

    the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable

  5. noun

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

    “the velocity of light is a
    constant
    see moresee less

    types:

    show 24 types…
    hide 24 types…
    Avogadro number, Avogadro’s number

    the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)
    Boltzmann’s constant

    constant used in the calculation of the ideal gas constant
    coefficient

    a constant number that serves as a measure of some property or characteristic
    cosmological constant

    an arbitrary constant in the equations of general relativity theory
    equilibrium constant

    (chemistry) the ratio of concentrations when equilibrium is reached in a reversible reaction (when the rate of the forward reaction equals the rate of the reverse reaction)
    R, gas constant, universal gas constant

    (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
    G, constant of gravitation, gravitational constant, universal gravitational constant

    (physics) the universal constant relating force to mass and distance in Newton’s law of gravitation
    Hubble constant, Hubble parameter, Hubble’s constant, Hubble’s parameter

    (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today
    ionic charge

    the charge on an ion is equal to a constant charge e multiplied by an integer from 1 to 15
    constant of proportionality, factor of proportionality

    the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality
    c, light speed, speed of light

    the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
    absorptance, absorption coefficient, coefficient of absorption

    a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber
    coefficient of drag, drag coefficient

    the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body
    coefficient of friction

    the ratio of the weight of an object being moved along a surface and the force that maintains contact between the object and the surface
    coefficient of mutual induction, mutual inductance

    a measure of the induction between two circuits; the ratio of the electromotive force in a circuit to the corresponding change of current in a neighboring circuit; usually measured in henries
    coefficient of self induction, self-inductance

    the ratio of the electromotive force produced in a circuit by self-induction to the rate of change of current producing it, expressed in henries
    modulus

    (physics) a coefficient that expresses how much of a specified property is possessed by a specified substance
    coefficient of expansion, expansivity

    the fractional change in length or area or volume per unit change in temperature at a given constant pressure
    coefficient of reflection, reflectance, reflection factor, reflectivity

    the fraction of radiant energy that is reflected from a surface
    transmission, transmittance

    the fraction of radiant energy that passes through a substance
    absolute viscosity, coefficient of viscosity, dynamic viscosity

    a measure of the resistance to flow of a fluid under an applied force
    weight, weighting

    (statistics) a coefficient assigned to elements of a frequency distribution in order to represent their relative importance
    dissociation constant

    the equilibrium constant for a reversible dissociation
    Planck’s constant, h

    the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
    type of:

    number

    a concept of quantity involving zero and units

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