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.

uninterrupted in time and indefinitely long continuing
“in
constant pain”
synonyms:
ceaseless, incessant, neverending, perpetual, unceasing, unremitting

continuous, uninterrupted
continuing in time or space without interruption

continuous, uninterrupted

unvarying in nature

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

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
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unchangeable

a quantity that does not vary

synonyms:

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

parameter, parametric quantity

a number representing a quantity assumed to have a fixed value in a specified mathematical context
“the velocity of light is a
constant”
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, selfinductance
the ratio of the electromotive force produced in a circuit by selfinduction 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 joulesecond

type of:

number
a concept of quantity involving zero and units