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It means something that doesn't change, like a number.
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.
A constant in an algebraic expression is a number that does not change. For example x + 2 The 2 is a constant (does not change) x is a variable (can take on any value)
if a number can change randomly it is called a variable
It is the approximate number of feet per hour in one knot.