Approximation

1. n. A value that is nearly but not exactly correct.
2. n. The act of approximating; a drawing, advancing or being near; approach; also, the result of approximating.
3. n. An approach to a correct estimate, calculation, or conception, or to a given quantity, quality, etc.
4. n. A continual approach or coming nearer to a result; as, to solve an equation by approximation.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.