exponent
In mathematics, a superscript number that indicates the number of times a term is multiplied by itself; for example x2 = x × x, 43 = 4 × 4 × 4.
Exponents obey certain rules. Terms that contain them are multiplied together by adding the exponents; for example, x2 × x5 = x7. Division of such terms is done by subtracting the exponents; for example, y5 ÷ y3 = y2. Any number with the exponent 0 is equal to 1; for example, x0 = 1 and 990 = 1.
See index notation.
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