Imperfect power

(Math.) a number which can not be produced by taking any whole number or vulgar fraction, as a factor, the number of times indicated by the power; thus, 9 is a perfect square, but an imperfect cube.

See also: Imperfect

References in periodicals archive ?
In a real sense, this averaging technique represents actual performance of a radar system because even though a large parasitic oscillation or poor risetime would degrade resolution of a radar target return, that imperfect power envelope still transmits out of the antenna and provides usable target illumination.
Regarding the powers of soul, Aquinas states that "the more imperfect powers precede the others in the order of generation, for the animal is generated before the man."