Variability

adjective
1.
apt or liable to vary or change; changeable:
variable weather; variable moods.
2.
capable of being varied or changed; alterable:
a variable time limit for completion of a book.
3.
inconstant; fickle:
a variable lover.
4.
having much variation or diversity.
5.
Biology. deviating from the usual type, as a species or a specific character.
6.
Astronomy. (of a star) changing in brightness.
7.
Meteorology. (of wind) tending to change in direction.
8.
Mathematics. having the nature or characteristics of a variable.
noun
9.
something that may or does vary or change; a variable feature or factor.
10.
Mathematics, Computers.

a quantity or function that may assume any given value or set of values.
a symbol that represents this.

11.
Logic. (in the functional calculus) a symbol for an unspecified member of a class of things or statements.
Compare bound variable, free variable.
12.
Astronomy. variable star.
13.
Meteorology.

a shifting wind, especially as distinguished from a trade wind.
variables, doldrums (def 2a).

adjective
1.
liable to or capable of change: variable weather
2.
(of behaviour, opinions, emotions, etc) lacking constancy; fickle
3.
(maths) having a range of possible values
4.
(of a species, characteristic, etc) liable to deviate from the established type
5.
(of a wind) varying its direction and intensity
6.
(of an electrical component or device) designed so that a characteristic property, such as resistance, can be varied: variable capacitor
noun
7.
something that is subject to variation
8.
(maths)

an expression that can be assigned any of a set of values
a symbol, esp x, y, or z, representing an unspecified member of a class of objects, numbers, etc See also dependent variable, independent variable

9.
(logic) a symbol, esp x, y, z, representing any member of a class of entities
10.
(computing) a named unit of storage that can be changed to any of a set of specified values during execution of a program
11.
(astronomy) See variable star
12.
a variable wind
13.
(pl) a region where variable winds occur

variable var·i·a·ble (vâr’ē-ə-bəl, vār’-)
adj.

Likely to change or vary; subject to variation; changeable.

Tending to deviate, as from a normal or recognized type; aberrant.

Having no fixed quantitative value.

n.

Something that varies or that is prone to variation.

A quantity that is capable of assuming any of a set of values.

variable
(vâr’ē-ə-bəl)

A mathematical quantity capable of assuming any of a set of values, such as x in the expression 3x + 2.

A factor or condition that is subject to change, especially one that is allowed to change in a scientific experiment to test a hypothesis. See more at control.