Remove the variable from a value or one side of an equation. A constant is just a number.
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A number without a variable. Ex.) 5 is a constant, 5x is not.
Math uses letters to indicate that specific numbers are not known or as an abbreviation for certain constant.
It means something that doesn't change, like a number.
It is a number that comes up in math and is independent of the physical measurement. Some examples that are well know are e and pi. As the name implies, the numbers do not change---they are constant. Usually math constants are real and not imaginary numbers.
It means that the first derivative is a constant. The derivative may be with regard to time or any other variable.