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A number without a variable. Ex.) 5 is a constant, 5x is not.
Constant just means that the number does not change. For example, in Chemistry, avogadro's number is 6.022x10^23 and that number will never change, therefore it is a constant.
I think that you are thinking of a math constant. A constant is something that doesn't change. The opposite would be a variable, which can change. For example: y=5 In this case, y always equals 5; so y is a constant. Second example; y=2x In this example, y is a variable, because its value depends upon the value of x. For example, if x=2, then y=4, but if x=10, then y=20.
It is the constant representing the ratio of the circumference of a circle to its diameter.
1+1=3