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|Noun||1.||natural action - a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity"|
physical process, process - a sustained phenomenon or one marked by gradual changes through a series of states; "events now in process"; "the process of calcification begins later for boys than for girls"
radiation - the spread of a group of organisms into new habitats
absorption - (physics) the process in which incident radiated energy is retained without reflection or transmission on passing through a medium; "the absorption of photons by atoms or molecules"
acidification - the process of becoming acid or being converted into an acid
adiabatic process - (thermodynamics) any process that occurs without gain or loss of heat
aeration - the process of exposing to air (so as to purify); "the aeration of the soil"
antiredeposition - the process of preventing redeposition
capture - any process in which an atomic or nuclear system acquires an additional particle
capture - a process whereby a star or planet holds an object in its gravitational field
centrifugation - 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
chromatography - a process used for separating mixtures by virtue of differences in absorbency
concretion - the formation of stonelike objects within a body organ (e.g., the kidneys)
condensation - the process of changing from a gaseous to a liquid or solid state
convection - (meteorology) the vertical movement of heat or other properties by massive motion within the atmosphere
decay - the process of gradually becoming inferior
desorption - changing from an adsorbed state on a surface to a gaseous or liquid state
diffusion - (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
distillation, distillment - the process of purifying a liquid by boiling it and condensing its vapors
drift - the gradual departure from an intended course due to external influences (as a ship or plane)
effervescence - 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
extinction - the reduction of the intensity of radiation as a consequence of absorption and radiation
extraction - the process of obtaining something from a mixture or compound by chemical or physical or mechanical means
feedback - the process in which part of the output of a system is returned to its input in order to regulate its further output
filtration - the process whereby fluids pass through a filter or a filtering medium
flocculation - the process of flocculating; forming woolly cloudlike aggregations
flow - any uninterrupted stream or discharge
formation - natural process that causes something to form; "the formation of gas in the intestine"; "the formation of crystals"; "the formation of pseudopods"
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, solidification, solidifying, hardening, set - the process of becoming hard or solid by cooling or drying or crystallization; "the hardening of concrete"; "he tested the set of the glue"
inactivation - the process of rendering inactive; "the gene inactivation system"; "thermal inactivation of serum samples"
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