What does variable mean?
A variable is something that can change, vary, or take more than one value. Used as an adjective, it describes conditions, factors, or features whose amount or character is not fixed: variable weather, variable costs, or a variable schedule. Used as a noun, it names a factor or quantity that may differ from one case, situation, or experiment to another, such as a variable in an equation or study. The word is especially important in mathematics and statistics, where a variable represents a value that can change, including random and dependent variables. In broader contexts, variable can imply flexibility but also unpredictability or instability. Its usefulness lies in describing the opposite of what is fixed or constant, while its formal history links it to the Latin idea of being varied or different.
Able to change, or varying in value, quality, or circumstance.
"The variable conditions forced the hikers to change their route."
Common in general, academic, scientific, and financial contexts. It can describe anything that is not fixed or constant.
A factor, quantity, or condition that can take different values or outcomes.
"Temperature is an important variable in this experiment."
Especially common in mathematics, statistics, science, economics, and research, where it denotes an element whose value may change.
The plural is variables; in technical contexts, it commonly refers to multiple mathematical, scientific, or experimental factors.
"The model includes several variables, including age, income, and location."
Variable comes from the Latin word variabilis, meaning “able to be varied” — a reminder that its defining quality is change.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of variable
The English word comes from Latin variabilis, meaning “capable of being varied” or “changeable.” It was formed from variare, “to vary,” which in turn derives from varius, “different” or “various.” The same Latin root produced English forms such as variety, various, variant, and variance, linking the modern word to a wider family concerned with variation and difference.
Related word forms
How variable is actually used
As an adjective, variable is common in formal and technical writing but also suitable for general contexts. As a noun, it is especially frequent in mathematics, statistics, science, and discussions of influencing factors. In everyday use, it often suggests that something is changeable rather than fixed.
Easily confused with variable
A variable is something that can change or take different values, whereas variance is the extent to which values differ from their average.