(mathematics) A function whose value is the same for all the elements of its domain.

(mathematics) A function of one or more independent variables, at least one of which is itself a function of one or more other independent variables; a function of function(s).

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

(computing) Any function that is provided as part of a high-level language and can be executed by a simple reference with specification of arguments

Any mathematical relationship between an activity and its cost.

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

(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

(physics) The relationship between the energy of an electron and its ability to excite an atom to a particular excited state

(mathematics) Any function that is a solution of the Bessel equation