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 (ĕv′ə-lo͞o′shən, ē′və-)
a. A gradual process in which something changes into a different and usually more complex or better form.
b. A result of this process; a development: Judo is an evolution of an earlier martial art.
2. Biology
a. Change in the genetic composition of a population during successive generations, often resulting in the development of new species. The mechanisms of evolution include natural selection acting on the genetic variation among individuals, mutation, migration, and genetic drift.
b. The historical development of a related group of organisms; phylogeny.
3. Astronomy Change in the structure, chemical composition, or dynamical properties of a celestial object or system such as a planetary system, star, or galaxy. Evolution often changes the observable or measurable characteristics of the object or system.
4. A movement that is part of a set of ordered movements: naval evolutions in preparation for battle.
5. Mathematics The extraction of a root of a quantity.

[Latin ēvolūtiō, ēvolūtiōn-, from ēvolūtus, past participle of ēvolvere, to unroll; see evolve.]

ev′o·lu′tion·al, ev′o·lu′tion·ar′y (-shə-nĕr′ē) adj.
ev′o·lu′tion·ar′i·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
The demand for footwear types to meet the objectives of comfort, durability, trendiness, and the pricing is shaping the various evolutional trajectories of the market.
This new evolutional approach allows them to treat the problem in its natural setting, they say, and these new considerations lighten the dynamical aspects of the Bellman function, in particular the evolution of its picture.
'Aboriginal democracy will focus on cultural historicity, evolutional modernity and global relativity as the necessary ingredients of our evolutional political indigenisation.
"Adiponectin and Adiponectin Receptors." Japan; and Core Research for Evolutional Science and Technology of Japan Science and Technology Agency.
Evolutional and prognostic particularities in early onset schizophrenia.
For the used example, the population size is set to be 100, the evolutional generation is 100.
They have been dedicated to being a company focused on R&D and substantiated by creative and evolutional research and technology.
These are the "evolutional" next steps from the previous section where most of the processes have been known and in use since the early days of Photoshop and image processing.
Chen, "Multi-objective optimization model and evolutional solution of network node matching problem," Physica A: Statistical Mechanics and its Applications, vol.
It is possible to assume that the ability to perceive the depth and volume on the planar images refers to the evolutional mechanisms of the visual system in the modern conditions of the technogenic habitat.

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