Webster's English Dictionary

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saturation

sat.u.ra.tion \.sach-*-'ra--sh*n\ n 1: the act of saturating : the state of 
   being saturated  2: SATIETY, SURFEIT  3: magnetization to the point beyond 
   which a further increase in the intens ity of the magnetizing force will 
   produce no further magnetization 4a: chromatic purity : freedom from 
   dilution with white : INTENSITY)M 4b1: degree of difference from the gray 
   having the same lightness - used  of an object color 4b2: degree of 
   difference from the achromatic light-source color of the sam e brightness - 
   used of a light-source color 5: the supplying of a market with all the 
   goods it will absorb  6: an overwhelming concentration of military forces 
   or firepower