(mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)
what something is used for
the actions and activities assigned to or required or expected of a person or group
exercise authoritative control or power over
lessen the intensity of; temper; hold in restraint; hold or keep within limits
power to direct or determine
a relation of constraint of one entity (thing or person or group) by another
(physiology) regulation or maintenance of a function or action or reflex etc
