(architecture) A doctrine, in several fields, that the function of something should be reflected in its design and the materials used in its construction

(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

(astronomy) a relationship that specifies the mass distribution of a newly formed stellar population

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

The ratio of the Laplace transform of the primary feedback signal of a control system to that of the actuating signal

(mathematics) The logarithm of a trigonometric function

(mathematics) Any function that possesses a finite integral

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