variable
nounUK /ˈveəriəbl/
US /ˈveriəbl/
Something that can change or be different.
The weather is a variable that makes planning a picnic hard.
OTHER MEANINGS
2. In math, a letter or symbol that stands for a number we do not know yet.
In the equation x + 3 = 7, x is the variable.
3. In science, a thing that can be changed in an experiment.
The scientist changed one variable, the amount of water, to see how the plant grew.
4. Able to be changed or adjusted.
The chair has a variable height so anyone can use it.