A constant progression or force. On a graph, a linear example is a straight line. Contrast with "exponential" or "geometric," which are both nonlinear. For example, a linear set of numbers is **1, 3, 5, 7, 9, 11**, etc., each number a constant increase of "2." An exponential progression might be **1, 5, 11, 20, 32, 54, 85**, etc., each element a larger difference than the previous one. A doubling is also exponential, such as **1, 2, 4, 8, 16, 32**, etc.

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