car·bon·i·za·tion 
(kär′bə-nĭ-zāshən)
(kär′bə-nĭ-zāshən)n.
1. The process of carbonizing.
2. The destructive distillation of bituminous coal, done in the absence of air in order to obtain coke and other fractions having a greater percentage of carbon than the original material.