natural action

/ˌnætʃərəl ˌækʃən/

Other forms: natural actions

Definitions of natural action
  1. noun
    a process existing in or produced by nature (rather than by the intent of human beings)
    synonyms: action, activity, natural process
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    the spread of a group of organisms into new habitats
    (physics) the process in which incident radiated energy is retained without reflection or transmission on passing through a medium
    the process of becoming acid or being converted into an acid
    adiabatic process
    (thermodynamics) any process that occurs without gain or loss of heat
    the process of exposing to air (so as to purify)
    the process of preventing redeposition
    any process in which an atomic or nuclear system acquires an additional particle
    a process whereby a star or planet holds an object in its gravitational field
    the process of separating substances of different densities by the use of a centrifuge
    chemical action, chemical change, chemical process
    (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved
    a process used for separating mixtures by virtue of differences in absorbency
    the formation of stonelike objects within a body organ (e.g., the kidneys)
    the process of changing from a gaseous to a liquid or solid state
    (meteorology) the vertical movement of heat or other properties by massive motion within the atmosphere
    clotting, coagulation, curdling
    the process of forming semisolid lumps in a liquid
    the process of gradually becoming inferior
    demagnetisation, demagnetization
    the process of removing magnetization
    changing from an adsorbed state on a surface to a gaseous or liquid state
    (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration
    disintegration, dissolution
    separation into component parts
    distillation, distillment
    the process of purifying a liquid by boiling it and condensing its vapors
    the gradual departure from an intended course due to external influences (as a ship or plane)
    the process of bubbling as gas escapes
    cataphoresis, dielectrolysis, electrophoresis, ionophoresis
    the motion of charged particles in a colloid under the influence of an electric field; particles with a positive charge go to the cathode and negative to the anode
    ecesis, establishment
    (ecology) the process by which a plant or animal becomes established in a new habitat
    the reduction of the intensity of radiation as a consequence of absorption and radiation
    the process of obtaining something from a mixture or compound by chemical or physical or mechanical means
    the process in which part of the output of a system is returned to its input in order to regulate its further output
    the process whereby fluids pass through a filter or a filtering medium
    the process of flocculating; forming woolly cloudlike aggregations
    any uninterrupted stream or discharge
    natural process that causes something to form
    fossilisation, fossilization
    the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone
    geologic process, geological process
    (geology) a natural process whereby geological features are modified
    curing, hardening, set, solidification, solidifying
    the process of becoming hard or solid by cooling or drying or crystallization
    the process of rendering inactive
    ion exchange
    a process in which ions are exchanged between a solution and an insoluble (usually resinous) solid; widely used in industrial processing
    ionisation, ionization
    the process of ionizing; the formation of ions by separating atoms or molecules or radicals or by adding or subtracting electrons from atoms by strong electric fields in a gas
    leach, leaching
    the process of leaching
    magnetic induction, magnetisation, magnetization
    the process that makes a substance magnetic (temporarily or permanently)
    materialisation, materialization
    the process of coming into being; becoming reality
    nuclear reaction
    (physics) a process that alters the energy or structure or composition of atomic nuclei
    the process of becoming cloudy or opaque
    the process of oscillating between states
    the process of providing or combining or treating with oxygen
    pair creation, pair formation, pair production
    the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus
    phase change, phase transition, physical change, state change
    a change from one state (solid or liquid or gas) to another without a change in chemical composition
    precession of the equinoxes
    a slow westward shift of the equinoxes along the plane of the ecliptic caused by precession of the Earth's axis of rotation
    a process that liberates or discharges something
    (geology) the leaping movement of sand or soil particles as they are transported in a fluid medium over an uneven surface
    the physical process in which particles are deflected haphazardly as a result of collisions
    raising silkworms in order to obtain raw silk
    (technology) a process that acts to absorb or remove energy or a substance from a system
    soak, soakage, soaking
    the process of becoming softened and saturated as a consequence of being immersed in water (or other liquid)
    the process of becoming softer
    the process in which one substance takes up or holds another (by either absorption or adsorption)
    (technology) a process by which energy or a substance enters a system
    rigidification, rigidifying, stiffening
    the process of becoming stiff or rigid
    (physiology) the effect of a stimulus (on nerves or organs etc.)
    ecological succession, succession
    (ecology) the gradual and orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is established
    natural selection, selection, survival, survival of the fittest
    a natural process resulting in the evolution of organisms best adapted to the environment
    synergism, synergy
    the working together of two things (muscles or drugs for example) to produce an effect greater than the sum of their individual effects
    temperature change
    a process whereby the degree of hotness of a body (or medium) changes
    the process whereby a transducer accepts energy in one form and gives back related energy in a different form
    the passage of gases through fine tubes because of differences in pressure or temperature
    the process of becoming vitreous
    heat sink
    a metal conductor specially designed to conduct (and radiate) heat
    adaptive radiation
    the development of many different forms from an originally homogeneous group of organisms as they fill different ecological niches
    airstream, backwash, race, slipstream, wash
    the flow of air that is driven backwards by an aircraft propeller
    turbulent flow
    flow in which the velocity at any point varies erratically
    streamline flow
    flow of a gas or liquid in which the velocity at any point is relatively steady
    absorption, soaking up
    (chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid
    stimulation of activity in an organism or chemical
    the process of introducing an acyl group into a compound
    adsorption, surface assimilation
    the accumulation of molecules of a gas to form a thin film on the surface of a solid
    (meteorology) the horizontal transfer of heat or other atmospheric properties
    agglutinating activity, agglutination
    the coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated
    gradual formation of new land, by recession of the sea or deposit of sediment
    conversion of starch to sugar
    (chemistry) any process of combination (especially in solution) that depends on relatively weak chemical bonding
    blood clotting, blood coagulation
    a process in which liquid blood is changed into a semisolid mass (a blood clot)
    blueing, bluing
    a process that makes something blue (or bluish)
    a process that impregnates something with calcium (or calcium salts)
    catalysis, contact action
    acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction
    caries, cavity, dental caries, tooth decay
    soft decayed area in a tooth; progressive decay can lead to the death of a tooth
    chain reaction
    a self-sustaining nuclear reaction; a series of nuclear fissions in which neutrons released by splitting one atom leads to the splitting of others
    the process of forming a ring by forming one or more hydrogen bonds
    chemical reaction, reaction
    (chemistry) a process in which one or more substances are changed into others
    the addition or substitution of chlorine in organic compounds
    the breaking of a chemical bond in a molecule resulting in smaller molecules
    climate change, global climate change
    a change in the world's climate
    column chromatography
    chromatography that uses selective adsorption by a column of powders
    congealment, congelation
    the process of congealing; solidification by (or as if by) freezing
    the transfer of heat through a fluid (liquid or gas) caused by molecular motion
    chilling, cooling, temperature reduction
    the process of becoming cooler; a falling temperature
    corroding, corrosion, erosion
    erosion by chemical action
    decay of matter (as by rot or oxidation)
    the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process)
    deamination, deaminization
    removal of the amino radical from an amino acid or other amino compound
    loss of calcium from bones or teeth
    the process of removing a carboxyl group from a chemical compound (usually replacing it with hydrogen)
    decay, disintegration, radioactive decay
    the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
    (pharmacology) the extraction of water-soluble drug substances by boiling
    decomposition, putrefaction, rot, rotting
    (biology) the process of decay caused by bacterial or fungal action
    the process of making a (steel) ship's hull nonmagnetic by producing an opposing magnetic field
    dehydration, desiccation, drying up, evaporation
    the process of extracting moisture
    the removal of iodine atoms from organic compounds
    demineralisation, demineralization
    the removal of minerals and mineral salts from a liquid (especially from water)
    desalination, desalinisation, desalinization
    the removal of salt (especially from sea water)
    the gradual transformation of habitable land into desert; is usually caused by climate change or by destructive use of the land
    the process of deformation that produces continents and ocean basins in the earth's crust
    the process of decomposing organic matter (as in sewage) by bacteria or by chemical action or heat
    dilapidation, ruin
    the process of becoming dilapidated
    (chemistry) the temporary or reversible process in which a molecule or ion is broken down into smaller molecules or ions
    the process of extracting one material from another by washing with a solvent to remove adsorbed material from an adsorbent (as in washing of loaded ion-exchange resins to remove captured ions); used to obtain uranium ions
    the release of electrons from parent atoms
    endoergic reaction
    a nuclear reaction occurring with absorption of energy
    eating away, eroding, erosion, wearing, wearing away
    (geology) the mechanical process of wearing or grinding something down (as by particles washing over it)
    exoergic reaction
    a nuclear reaction accompanied by the evolution of energy
    a normal ongoing process that dissolves fibrin and results in the removal of small blood clots
    flow into something (as a container)
    fission, nuclear fission
    a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
    gradual internal motion or deformation of a solid body (as by heat)
    fold, folding
    a geological process that causes a bend in a stratum of rock
    freeze, freezing
    the withdrawal of heat to change something from a liquid to a solid
    fusion, nuclear fusion, nuclear fusion reaction
    a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
    galvanisation, galvanization
    stimulation with a galvanic current
    the process of changing into gas
    the process of interacting with gas
    the process of covering the earth with glaciers or masses of ice
    heating, warming
    the process of becoming warmer; a rising temperature
    a chemical process that adds hydrogen atoms to an unsaturated oil
    electrophoresis to separate antigens and antibodies
    encrustation, incrustation
    the formation of a crust
    inflow, influx
    the process of flowing in
    the process of extracting certain active properties (as a drug from a plant) by steeping or soaking (usually in water)
    the forcing of molten rock into fissures or between strata of an earlier rock formation
    intumescence, intumescency, swelling
    the increase in volume of certain substances when they are heated (often accompanied by release of water)
    a chemical process in which the direction of optical rotation of a substance is reversed from dextrorotatory to levorotary or vice versa
    the substitution or addition of iodine atoms in organic compounds
    (of a ship or plane) sideways drift
    (astronomy) a real or apparent slow oscillation of a moon or satellite
    the conversion of a solid or a gas into a liquid
    (biochemistry) dissolution or destruction of cells such as blood cells or bacteria
    softening due to soaking or steeping
    chemical mechanism, mechanism
    the atomic process that occurs during a chemical reaction
    change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances
    the transduction of sound waves into electrical waves (by a microphone)
    beneficiation, mineral dressing, mineral extraction, mineral processing, ore dressing, ore processing
    crushing and separating ore into valuable substances or waste by any of a variety of techniques
    negative feedback
    feedback in opposite phase with (decreasing) the input
    the chemical process in which a nitro group is added to an organic compound (or substituted for another group in an organic compound)
    the process of mountain formation (especially by the upward displacement of the earth's crust)
    (biology, chemistry) diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal
    effluence, efflux, outflow
    the process of flowing out
    paper chromatography
    chromatography that uses selective adsorption on a strip of paper
    carrier electrophoresis, paper electrophoresis
    electrophoresis carried out on filter paper
    peptisation, peptization
    the process of converting to a sol; bringing to a colloidal solution
    infiltration, percolation
    the slow passage of a liquid through a filtering medium
    permeation, pervasion, suffusion
    the process of permeating or infusing something with a substance
    petrifaction, petrification
    the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape
    synthesis of compounds with the aid of radiant energy (especially in plants)
    polymerisation, polymerization
    a chemical process that combines several monomers to form a polymer or polymeric compound
    positive feedback, regeneration
    feedback in phase with (augmenting) the input
    (medicine) the synergistic effect of two drugs given simultaneously
    the process of forming a chemical precipitate
    the hydrolysis of proteins into peptides and amino acids by cleavage of their peptide bonds
    pyrochemical process, pyrochemistry
    processes for chemical reactions at high temperatures
    (photography) the formation of a network of cracks or wrinkles in a photographic emulsion
    rigor mortis
    muscular stiffening that begins 2 to 4 hours after death and lasts for about 4 days
    the action of forming a chelate or other stable compound with an ion or atom or molecule so that it is no longer available for reactions
    the source of something's existence or from which it derives or is derived
    (physics) a nuclear reaction in which a bombarded nucleus breaks up into many particles
    spoilage, spoiling
    the process of becoming spoiled
    forming or depositing in layers
    a geological process in which one edge of a crustal plate is forced sideways and downward into the mantle below another plate
    synaeresis, syneresis
    the separation of liquid from a gel that is caused by contraction (as in cheese making)
    the process of producing a chemical compound (usually by the union of simpler chemical compounds)
    melt, melting, thaw, thawing
    the process whereby heat changes something from a solid to a liquid
    congealing tissue by heat (as by electric current)
    the process of transfering an amino group from one compound to another
    the process of transposing an amino group within a chemical compound
    an exchange of molecules (and their kinetic energy and momentum) across the boundary between adjacent layers of a fluid or across cell membranes
    centrifugation at very high speeds
    evaporation, vapor, vaporisation, vaporization, vapour
    the process of becoming a vapor
    ferment, fermentation, fermenting, zymolysis, zymosis
    a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol
    a method of extracting natural gas or oil from rock by injecting liquid at high pressure
    type of:
    physical process, process
    a sustained phenomenon or one marked by gradual changes through a series of states
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