funktsioon

noun
  1. In mathematics, a function is a relation between a set of inputs and a set of permissible outputs, with the property that each input is related to exactly one output. noun
    The function f(x) = x^2 maps each real number x to its square.
    In calculus, the derivative of a function measures how the function value changes as its input changes.
  2. In general usage, a function refers to the purpose or role that something is designed or expected to perform. noun
    The primary function of the heart is to pump blood throughout the body.
    The function of a thermostat is to regulate the temperature of a room.