variable


variable
/vair"ee euh beuhl/, adj.
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. Biol. deviating from the usual type, as a species or a specific character.
6. Astron. (of a star) changing in brightness.
7. Meteorol. (of wind) tending to change in direction.
8. Math. having the nature or characteristics of a variable.
n.
9. something that may or does vary; a variable feature or factor.
10. Math., Computers.
a. a quantity or function that may assume any given value or set of values.
b. a symbol that represents this.
11. Logic. (in the functional calculus) a symbol for an unspecified member of a class of things or statements. Cf. bound variable, free variable.
12. Astron. See variable star.
13. Meteorol.
a. a shifting wind, esp. as distinguished from a trade wind.
b. variables, doldrums (def. 2a).
[1350-1400; late ME < L variabilis, equiv. to vari(us) VARIOUS + -abilis -ABLE]
Syn. 3. vacillating, wavering, fluctuating, unsteady, mercurial.
Ant. 1, 3. constant.

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I
In algebra, a symbol (usually a letter) standing in for an unknown numerical value in an equation.

Commonly used variables include x and y (real-number unknowns), z (complex-number unknowns), t (time), r (radius), and s (arc length). Variables should be distinguished from coefficients, fixed values that multiply powers of variables in polynomials and algebraic equations. In the quadratic equation ax2 + bx + c = 0, x is the variable and a, b and c are coefficients whose values must be specified to solve the equation. In translating word problems into algebraic equations, quantities to be determined can be represented by variables.
II
(as used in expressions)

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Universalium. 2010.

Synonyms:
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