Saturation /(?)/

Sat·u·ra·tion

Saturation

n.
  1. The act of saturating, or the state of being saturating; complete penetration or impregnation.
  2. The act, process, or result of saturating a substance, or of combining it to its fullest extent. (Chem.)
  3. Freedom from mixture or dilution with white; purity; -- said of colors. (Optics)