The Collaborative International Dictionary of English v.0.48:
Cementation \Cem`en*ta"tion\, n.
1. The act or process of cementing.
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.