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The Collaborative International Dictionary
Variability

Variability \Va`ri*a*bil"i*ty\, n. [Cf. F. variabilit['e].]

  1. The quality or state of being variable; variableness.

  2. (Biol.) The power possessed by living organisms, both animal and vegetable, of adapting themselves to modifications or changes in their environment, thus possibly giving rise to ultimate variation of structure or function.

Douglas Harper's Etymology Dictionary
variability

1771, from variable (Latin variabilis) + -ity.

Wiktionary
variability

n. 1 the state or characteristic of being variable 2 the degree to which a thing is variable. In data or statistics this is often a measurement of distance from the mean or a description of data range.

WordNet
variability
  1. n. the quality of being subject to variation [syn: variableness, variance] [ant: invariability, invariability]

  2. a quality of variability and lack of uniformity [syn: unevenness] [ant: evenness, evenness]

Wikipedia
Variability

Variability is how spread out or closely clustered a set of data is.

Variability may refer to:

  • Climate variability, changes in the components of Earth's climate system and their interactions
  • Genetic variability, a measure of the tendency of individual genotypes in a population to vary from one another
  • Heart rate variability, a physiological phenomenon where the time interval between heart beats varies
  • Human variability, the range of possible values for any measurable characteristic, physical or mental, of human beings
  • Spatial variability, when a quantity that is measured at different spatial locations exhibits values that differ across the locations
  • Statistical variability, a measure of dispersion in statistics
  • Variable renewable energy
  • Variability function, a component of Bernoulli stochastics, a mathematical model
  • Variability hypothesis, nineteenth century hypothesis that males have a greater range of ability than females

Usage examples of "variability".

A large amount of inheritable and diversified variability is favourable, but I believe mere individual differences suffice for the work.

The Lady Doris Grownsnatch of Grownsnatch House once came home to find her four pet corgis walking on their hind legs, smoking gold leaf Coronas, drinking violet label Lumlian port and angrily debating the importance of a neoteric treaty with the barbarian tribes of the Barren Lands in relation, specifically, to trade variability code practices, at Guild and sub-Guild level, and, generally, to its potential affect on the Stock Exchange, vis-a-vis devaluation of red-rimmed stock ownership and level-playing-field industrial macro-reform in the northern Realms.

Whether such variability be taken advantage of by natural selection, and whether the variations be accumulated to a greater or lesser amount, thus causing a greater or lesser amount of modification in the varying species, depends on many complex contingencies,--on the variability being of a beneficial nature, on the power of intercrossing, on the rate of breeding, on the slowly changing physical conditions of the country, and more especially on the nature of the other inhabitants with which the varying species comes into competition.

The effects of variability are modified by various degrees of inheritance and of reversion.

There may be truly said to be a constant struggle going on between, on the one hand, the tendency to reversion to a less modified state, as well as an innate tendency to further variability of all kinds, and, on the other hand, the power of steady selection to keep the breed true.

For in this case the variability will seldom as yet have been fixed by the continued selection of the individuals varying in the required manner and degree, and by the continued rejection of those tending to revert to a former and less modified condition.

This greater variability of mongrels than of hybrids does not seem to me at all surprising.

The slight degree of variability in hybrids from the first cross or in the first generation, in contrast with their extreme variability in the succeeding generations, is a curious fact and deserves attention.

Nearly all geology texts tell you that continental crust is three to six miles thick under the oceans, about twenty-five miles thick under the continents, and forty to sixty miles thick under big mountain chains, but there are many puzzling variabilities within these generalizations.

When we reflect on the vast diversity of the plants and animals which have been cultivated, and which have varied during all ages under the most different climates and treatment, I think we are driven to conclude that this greater variability is simply due to our domestic productions having been raised under conditions of life not so uniform as, and somewhat different from, those to which the parent-species have been exposed under nature.

But the much greater variability, as well as the greater frequency of monstrosities, under domestication or cultivation, than under nature, leads me to believe that deviations of structure are in some way due to the nature of the conditions of life, to which the parents and their more remote ancestors have been exposed during several generations.

I will here only add that their variability seems to be owing to their uselessness, and therefore to natural selection having no power to check deviations in their structure.

Chapter II Variation under Nature Variability -- Individual Differences -- Doubtful species -- Wide ranging, much diffused, and common species vary most -- Species of the larger genera in any country vary more than the species of the smaller genera -- Many of the species of the larger genera resemble varieties in being very closely, but unequally, related to each other, and in having restricted ranges.

Chapter II Variation Under Nature Variability -- Individual differences -- Doubtful species -- Wide ranging, much diffused, and common species vary most -- Species of the larger genera in any country vary more than the species of the smaller genera -- Many of the species of the larger genera resemble varieties in being very closely, but unequally, related to each other, and in having restricted ranges.

Variability in the same parts of the organisation has generally been taken advantage of in giving secondary sexual differences to the sexes of the same species, and specific differences to the several species of the same genus.