variablefunction
nounA variable function is a math rule where the answer can change depending on the number you put in.
In the variable function y = 2x, the answer changes whenever you change x.
OTHER MEANINGS
2. In computer programming, a variable function is a piece of code that can do different things depending on the values given to it.
The programmer wrote a variable function that adds or subtracts numbers based on the user's choice.
3. A function whose value depends on one or more variables rather than being fixed.
Temperature as a variable function of time helped the students see how the weather changed during the day.
4. A mathematical expression in which the letters stand for numbers that can change.
The teacher explained that 3a + b is a variable function because a and b can be any number.