The Collaborative International Dictionary of English v.0.48:

Cementation \Cem`en*ta"tion\, n.
   1. The act or process of cementing.
      [1913 Webster]

   2. (Chem.) A process which consists in surrounding a solid
      body with the powder of other substances, and heating the
      whole to a degree not sufficient to cause fusion, the
      physical properties of the body being changed by chemical
      combination with powder; thus iron becomes steel by
      cementation with charcoal, and green glass becomes
      porcelain by cementation with sand.
      [1913 Webster]