Webster's English Dictionary

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approximation

ap.prox.i.ma.tion \*-.pra:k-s*-'ma--sh*n\ \*-'pra:k-s*-.ma-t-iv\ n 1: the 
   act or process of drawing together  2: the quality or state of being close 
   esp. in value  3: something that is approximate; esp : a mathematical value 
   that i s nearly but not exactly correct - ap.prox.i.ma.tive aj