1. The value that is assigned to a mathematical expression and its exponent.

2. For a point, with reference to a circle, the power of a set is its cardinality.

3. The quantity (x - a )² + (y - b )² - r², where x and y are the coordinates of the point, a and b are the coordinates of the center of the circle, and r is the radius of the circle.

4. For a point, with reference to a sphere, the quantity (x - a )² + (y - b )² + (z - c )² - r², where x, y, and z are the coordinates of the point; a, b, and c are the coordinates of the center of the sphere; and r is the radius of the sphere.

See <<focal power>>

The time rate of doing work.

One minus the probability that a given test causes the acceptance of the null hypothesis when it is false due to the validity of an alternative hypothesis; this is the same as the probability of rejecting the null hypothesis by the test when the alternative is true.