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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. (i. Taylor)

2. An approach to a correct estimate, calculation, or conception, or to a given quantity, quality, etc.

3. (Science: mathematics) a continual approach or coming nearer to a result; as, to solve an equation by approximation. A value that is nearly but not exactly correct.

Origin: cf. F. Approximation, LL. Approximatio.