Approximation

Ap·prox·i·ma·tion

Approximation

n.
  1. The act of approximating; a drawing, advancing or being near; approach; also, the result of approximating.
    The largest capacity and the most noble dispositions are but an approximation to the proper standard and true symmetry of human nature.
  2. An approach to a correct estimate, calculation, or conception, or to a given quantity, quality, etc.
  3. A continual approach or coming nearer to a result; as, to solve an equation by approximation. (Math.)