(mathematics) Any function in which an independent variable appears in the form of a logarithm; they are the inverse functions of exponential functions

(physics) The function governing the rate at which mechanical energy is converted to heat during viscous flow.

An electronic device used to generate a signal representing the periodic value of a given mathematical function, especially sine, square, triangle and sawtooth waveforms

(mathematics) Any function whose value may be directly calculated from the independent variable.

(computing) Any of a set of subroutines that perform standard mathematical functions included in a programming language; either included in a program at compilation time, or called when a program is executed

(mathematics) Any function whose value changes sign if the independent variable changes sign i.e. f(-x) = -f(x)

(mathematics) Either of a pair of functions whose inner product is zero

(mathematics) a meromorphic function

(statistics) Any function used to obtain a set of samples from a given population

(chemistry) The relationship between the acidity of a solution and the concentration of its solute.