Time seems to pass more quickly when one is enjoying oneself.

(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).

(mathematics) A function that is the inverse of an appropriate restriction of a trigonometric function.

(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.

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

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

(psychology) The management of mental processes by the ego in order to meet an individual's needs