(mathematics) Any generalized function which is defined by its behavior under integration.

(mathematics) Any function of a real variable whose value increases (or is constant) as the variable increases.

(mathematics) Any of a set of functions the value of which can not be deduced from that of all the others.

(mathematics) An entire function

(electronics) An electronic logic circuit which inverts the phase of a signal

(management) Any primary business function that would affect customers or profits if interrupted

(mathematics) Any function that possesses a finite integral

(mathematics) A function which expresses numerically the loss produced by a decision or other event

(mathematics) Any function whose graph is a straight line: f(x)=ax+b

(astronomy) A relative measure of the relationship between stellar magnitude and the distribution of stars between magnitudes